-55=-7b+2b

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Solution for -55=-7b+2b equation: 



-55=-7b+2b

We move all terms to the left:

-55-(-7b+2b)=0

We add all the numbers together, and all the variables

-(-5b)-55=0

We get rid of parentheses

5b-55=0

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

5b=55

b=55/5

b=11

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