3b+a-2(a+b)=

Solution for 3b+a-2(a+b)= equation:

Simplifying
3b + a + -2(a + b) = 0
3b + a + (a * -2 + b * -2) = 0
3b + a + (-2a + -2b) = 0

Reorder the terms:
a + -2a + 3b + -2b = 0

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

Combine like terms: 3b + -2b = 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 = b

Simplifying
a = b