Question

- ( - x ) = x for x=15/21​

Answer 1

Answer:

we know that - ( - x) is + x

here in the place of x, we substitute 15/21

so,

- ( - 15/21) can also be said as 15/21

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Answer 2

-(-5/7)=5/7
+5/7=5/7
Hence proved
LHS=RHS