7b=4b+120

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Solution for 7b=4b+120 equation: 



7b=4b+120

We move all terms to the left:

7b-(4b+120)=0

We get rid of parentheses

7b-4b-120=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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