b+120=4b

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Solution for b+120=4b equation: 



b+120=4b

We move all terms to the left:

b+120-(4b)=0

We add all the numbers together, and all the variables

-3b+120=0

We move all terms containing b to the left, all other terms to the right

-3b=-120

b=-120/-3

b=+40

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