7=-7b-21

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Solution for 7=-7b-21 equation: 



7=-7b-21

We move all terms to the left:

7-(-7b-21)=0

We get rid of parentheses

7b+21+7=0

We add all the numbers together, and all the variables

7b+28=0

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

7b=-28

b=-28/7

b=-4

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