1+2=b

Solution for 1+2=b equation:

Simplifying
1 + 2 = b

Combine like terms: 1 + 2 = 3
3 = b

Solving
3 = b

Solving for variable 'b'.

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

Add '-1b' to each side of the equation.
3 + -1b = b + -1b

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

Add '-3' to each side of the equation.
3 + -3 + -1b = 0 + -3

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

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

Divide each side by '-1'.
b = 3

Simplifying
b = 3