Question

verify that -(-x)=x for 7/12

Answer 1

-(-7/12)
= -×-(7/12)
= +(7/12)
=7/12

Answer 2

hey here is your answer

we know that
(-)×(-) always (+)

so given
-(-x) =x

according to this

-(-7/12) = (-)×(-)×7/12 = +7/12 = 7/12

I hope it will help you