-21=b-7

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Solution for -21=b-7 equation: 



-21=b-7

We move all terms to the left:

-21-(b-7)=0

We get rid of parentheses

-b+7-21=0

We add all the numbers together, and all the variables

-1b-14=0

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

-b=14

b=14/-1

b=-14

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