-13=b+7

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Solution for -13=b+7 equation: 



-13=b+7

We move all terms to the left:

-13-(b+7)=0

We get rid of parentheses

-b-7-13=0

We add all the numbers together, and all the variables

-1b-20=0

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

-b=20

b=20/-1

b=-20

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