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

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

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

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

Reorder the terms:
-1a + 3a + 1b + -3b = 0

Combine like terms: -1a + 3a = 2a
2a + 1b + -3b = 0

Combine like terms: 1b + -3b = -2b
2a + -2b = 0

Solving
2a + -2b = 0

Solving for variable 'a'.

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

Add '2b' to each side of the equation.
2a + -2b + 2b = 0 + 2b

Combine like terms: -2b + 2b = 0
2a + 0 = 0 + 2b
2a = 0 + 2b
Remove the zero:
2a = 2b

Divide each side by '2'.
a = b

Simplifying
a = b