2=a-b

Solution for 2=a-b equation:

Simplifying
2 = a + -1b

Solving
2 = a + -1b

Solving for variable 'a'.

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

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

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

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

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

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

Simplifying
a = 2 + b