-7(b+4)-1=8b-21

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Solution for -7(b+4)-1=8b-21 equation: 



-7(b+4)-1=8b-21

We move all terms to the left:

-7(b+4)-1-(8b-21)=0

We multiply parentheses

-7b-(8b-21)-28-1=0

We get rid of parentheses

-7b-8b+21-28-1=0

We add all the numbers together, and all the variables

-15b-8=0

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

-15b=8

b=8/-15

b=-8/15

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