120=3b+b

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Solution for 120=3b+b equation: 



120=3b+b

We move all terms to the left:

120-(3b+b)=0

We add all the numbers together, and all the variables

-(+4b)+120=0

We get rid of parentheses

-4b+120=0

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

-4b=-120

b=-120/-4

b=+30

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