-20=b-7

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Solution for -20=b-7 equation: 



-20=b-7

We move all terms to the left:

-20-(b-7)=0

We get rid of parentheses

-b+7-20=0

We add all the numbers together, and all the variables

-1b-13=0

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

-b=13

b=13/-1

b=-13

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