(?) 2(x + 4) = 12

(b) 3(n – 5) = 21

(c) 3(n – 5) = -21

(d) -4(2 + x) = 8

(e) 4(2 – x) = 8

Answer :

(a) 2(x+4) = 12

= x+4 = 12/2

= x = 6-4 = 2

(b) 3(n-5 ) = 21

= n-5 = 21 /3

= n =7+5= 12

(c) 3(n-5) = -21

= n-5 = -21 /3

= n= -7 +5 = = -2

(d) -4 (2+x) = 8

= 2+x = 8/-4

= x = -2 -2 = -4

(e) 4(2- x ) = 8

= 2- x = 8/4

= -x = 2-2

= x = 0

- Q.1 Solve the following equations: (a) 2y + (5/2) = (37/2) (b) 5t + 28 = 10 (c) (a/5) + 3 = 2 (d) (q/4) + 7 = 5 (e) (5/2) x = -5 (f) (5/2) x = 25/4 (g) 7m + (19/2) = 13 (h) 6z + 10 = – 2 (i) (3/2) l = 2/3 (j) (2b/3) – 5 = 3
- Q.3 Solve the following equations: (a) 4 = 5(p- 2) (b) -4 = 5(p – 2) (c) 16 = 4 + 3 (t + 2) (d) 4 + 5(p – 1) = 34 (e) 0 = 16 + 4(m – 6)
- Q.5 (a) Construct 3 equations starting with x = 2 (b) Construct 3 equations starting with x = -2.

- NCERT solutions for class 7 maths chapter 1 Integers
- NCERT solutions for class 7 maths chapter 2 Fractions and Decimals
- NCERT solutions for class 7 maths chapter 3 Data Handling
- NCERT solutions for class 7 maths chapter 4 Simple Equations
- NCERT solutions for class 7 maths chapter 5 Lines and Angles
- NCERT solutions for class 7 maths chapter 6 The Triangle and its Properties
- NCERT solutions for class 7 maths chapter 7 Congruence of Triangles
- NCERT solutions for class 7 maths chapter 8 Comparing Quantities
- NCERT solutions for class 7 maths chapter 9 Rational Numbers
- NCERT solutions for class 7 maths chapter 10 Practical Geometry
- NCERT solutions for class 7 maths chapter 11 Perimeter and Area
- NCERT solutions for class 7 maths chapter 12 Algebraic Expressions
- NCERT solutions for class 7 maths chapter 13 Exponents and Powers
- NCERT solutions for class 7 maths chapter 14 Symmetry
- NCERT solutions for class 7 maths chapter 15 Visualising Solid Shapes

- NCERT solutions for class 7 science chapter 1 Nutrition in Plants
- NCERT solutions for class 7 science chapter 2 Nutrition In Animals
- NCERT solutions for class 7 science chapter 3 Fibre to Fabric
- NCERT solutions for class 7 science chapter 4 Heat
- NCERT solutions for class 7 science chapter 5 Acids Bases and Salts
- NCERT solutions for class 7 science chapter 6 Physical and Chemical Changes
- NCERT solutions for class 7 science chapter 7 Weather, Climate and Adaptations of Animals to Climate
- NCERT solutions for class 7 science chapter 8 Winds, Storms and Cyclones
- NCERT solutions for class 7 science chapter 9 soil
- NCERT solutions for class 7 science chapter 10 Respiration in Organisms
- NCERT solutions for class 7 science chapter 11 Transportation in Animals and Plants
- NCERT solutions for class 7 science chapter 12 Reproduction In Plant
- NCERT solutions for class 7 science chapter 13 Motion and Time
- NCERT solutions for class 7 science chapter 14 Electric Current and Its Effects
- NCERT solutions for class 7 science chapter 15 Light
- NCERT solutions for class 7 science chapter 16 Water: A Precious Resource
- NCERT solutions for class 7 science chapter 17 Forests: Our Lifeline
- NCERT solutions for class 7 science chapter 18 Waste Water Story