b+90=2b-27

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Solution for b+90=2b-27 equation: 



b+90=2b-27

We move all terms to the left:

b+90-(2b-27)=0

We get rid of parentheses

b-2b+27+90=0

We add all the numbers together, and all the variables

-1b+117=0

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

-b=-117

b=-117/-1

b=+117

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