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-(-x) = x

x = x [ since, -(-) = + ]

Therefore, LHS = RHS

Hence, verified

x = x [ since, -(-) = + ]

Therefore, LHS = RHS

Hence, verified

it is very simple,

lets take a example⇒ -(-2) will be 2

that's like -(-x) =x subtraction sign will converted into addition sign...