-8b+8=-21

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Solution for -8b+8=-21 equation: 



-8b+8=-21

We move all terms to the left:

-8b+8-(-21)=0

We add all the numbers together, and all the variables

-8b+29=0

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

-8b=-29

b=-29/-8

b=3+5/8

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