ab-[ab+ac-a-(2a-ac)+2a-2ac]=

Solution for ab-[ab+ac-a-(2a-ac)+2a-2ac]= equation:

Simplifying
ab + -1[ab + ac + -1a + -1(2a + -1ac) + 2a + -2ac] = 0
ab + -1[ab + ac + -1a + (2a * -1 + -1ac * -1) + 2a + -2ac] = 0
ab + -1[ab + ac + -1a + (-2a + 1ac) + 2a + -2ac] = 0

Reorder the terms:
ab + -1[-1a + -2a + 2a + ab + ac + 1ac + -2ac] = 0

Combine like terms: -1a + -2a = -3a
ab + -1[-3a + 2a + ab + ac + 1ac + -2ac] = 0

Combine like terms: -3a + 2a = -1a
ab + -1[-1a + ab + ac + 1ac + -2ac] = 0

Combine like terms: ac + 1ac = 2ac
ab + -1[-1a + ab + 2ac + -2ac] = 0

Combine like terms: 2ac + -2ac = 0
ab + -1[-1a + ab + 0] = 0
ab + -1[-1a + ab] = 0
ab + [-1a * -1 + ab * -1] = 0
ab + [1a + -1ab] = 0

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

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

Solving
1a = 0

Solving for variable 'a'.

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

Divide each side by '1'.
a = 0

Simplifying
a = 0