1+a+b+a+b-1a-2b-2a+1=

Solution for 1+a+b+a+b-1a-2b-2a+1= equation:

Simplifying
1 + a + b + a + b + -1a + -2b + -2a + 1 = 0

Reorder the terms:
1 + 1 + a + a + -1a + -2a + b + b + -2b = 0

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

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

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

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

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

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

Solving
2 + -1a = 0

Solving for variable 'a'.

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

Add '-2' to each side of the equation.
2 + -2 + -1a = 0 + -2

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

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

Divide each side by '-1'.
a = 2

Simplifying
a = 2