-(-8-4)=a

Solution for -(-8-4)=a equation:

Simplifying
-1(-8 + -4) = a

Combine like terms: -8 + -4 = -12
-1(-12) = a

Multiply -1 * -12
12 = a

Solving
12 = a

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '-1a' to each side of the equation.
12 + -1a = a + -1a

Combine like terms: a + -1a = 0
12 + -1a = 0

Add '-12' to each side of the equation.
12 + -12 + -1a = 0 + -12

Combine like terms: 12 + -12 = 0
0 + -1a = 0 + -12
-1a = 0 + -12

Combine like terms: 0 + -12 = -12
-1a = -12

Divide each side by '-1'.
a = 12

Simplifying
a = 12