113-42=b

Solution for 113-42=b equation:

Simplifying
113 + -42 = b

Combine like terms: 113 + -42 = 71
71 = b

Solving
71 = 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.
71 + -1b = b + -1b

Combine like terms: b + -1b = 0
71 + -1b = 0

Add '-71' to each side of the equation.
71 + -71 + -1b = 0 + -71

Combine like terms: 71 + -71 = 0
0 + -1b = 0 + -71
-1b = 0 + -71

Combine like terms: 0 + -71 = -71
-1b = -71

Divide each side by '-1'.
b = 71

Simplifying
b = 71