-(a-b)-(a+b)=

Solution for -(a-b)-(a+b)= equation:

Simplifying
-1(a + -1b) + -1(a + b) = 0
(a * -1 + -1b * -1) + -1(a + b) = 0
(-1a + 1b) + -1(a + b) = 0
-1a + 1b + (a * -1 + b * -1) = 0
-1a + 1b + (-1a + -1b) = 0

Reorder the terms:
-1a + -1a + 1b + -1b = 0

Combine like terms: -1a + -1a = -2a
-2a + 1b + -1b = 0

Combine like terms: 1b + -1b = 0
-2a + 0 = 0
-2a = 0

Solving
-2a = 0

Solving for variable 'a'.

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

Divide each side by '-2'.
a = 0

Simplifying
a = 0