4b-36=b+84

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Solution for 4b-36=b+84 equation: 



4b-36=b+84

We move all terms to the left:

4b-36-(b+84)=0

We get rid of parentheses

4b-b-84-36=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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