120=b+b+b+b

Solution for 120=b+b+b+b equation:

Simplifying
120 = b + b + b + b

Combine like terms: b + b = 2b
120 = 2b + b + b

Combine like terms: 2b + b = 3b
120 = 3b + b

Combine like terms: 3b + b = 4b
120 = 4b

Solving
120 = 4b

Solving for variable 'b'.

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

Add '-4b' to each side of the equation.
120 + -4b = 4b + -4b

Combine like terms: 4b + -4b = 0
120 + -4b = 0

Add '-120' to each side of the equation.
120 + -120 + -4b = 0 + -120

Combine like terms: 120 + -120 = 0
0 + -4b = 0 + -120
-4b = 0 + -120

Combine like terms: 0 + -120 = -120
-4b = -120

Divide each side by '-4'.
b = 30

Simplifying
b = 30