b=7+2b

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Solution for b=7+2b equation: 



b=7+2b

We move all terms to the left:

b-(7+2b)=0

We add all the numbers together, and all the variables

b-(2b+7)=0

We get rid of parentheses

b-2b-7=0

We add all the numbers together, and all the variables

-1b-7=0

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

-b=7

b=7/-1

b=-7

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