7b+21=8b-12

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Solution for 7b+21=8b-12 equation: 



7b+21=8b-12

We move all terms to the left:

7b+21-(8b-12)=0

We get rid of parentheses

7b-8b+12+21=0

We add all the numbers together, and all the variables

-1b+33=0

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

-b=-33

b=-33/-1

b=+33

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