a+a+b+b-a-b=

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

Simplifying
a + a + b + b + -1a + -1b = 0

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

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

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

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

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

Solving
1a + 1b = 0

Solving for variable 'a'.

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

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

Combine like terms: 1b + -1b = 0
1a + 0 = 0 + -1b
1a = 0 + -1b
Remove the zero:
1a = -1b

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

Simplifying
a = -1b