-(3a-9b)-3(b-a)=

Solution for -(3a-9b)-3(b-a)= equation:

Simplifying
-1(3a + -9b) + -3(b + -1a) = 0
(3a * -1 + -9b * -1) + -3(b + -1a) = 0
(-3a + 9b) + -3(b + -1a) = 0

Reorder the terms:
-3a + 9b + -3(-1a + b) = 0
-3a + 9b + (-1a * -3 + b * -3) = 0
-3a + 9b + (3a + -3b) = 0

Reorder the terms:
-3a + 3a + 9b + -3b = 0

Combine like terms: -3a + 3a = 0
0 + 9b + -3b = 0
9b + -3b = 0

Combine like terms: 9b + -3b = 6b
6b = 0

Solving
6b = 0

Solving for variable 'b'.

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

Divide each side by '6'.
b = 0

Simplifying
b = 0