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Answer :
(i) We have x=\(\frac{11}5\)
∴ -x=\(\frac{-11}{15}\)
-(-x)=\(-(\frac{-11}{15}) = \frac{11}{15}=x \quad\)[∵ (-)×(-)=(+)]
Hence verified
(ii)We have x=\(\frac{-13}{17}\)
∴ -x=\(-(\frac{-13}{17})=\frac{13}{17}\)[∵ (-)×(-)=(+)]
-(-x)=\(-(\frac{13}{17})=x (Verified)\)