7b+12=8b+15

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Solution for 7b+12=8b+15 equation: 



7b+12=8b+15

We move all terms to the left:

7b+12-(8b+15)=0

We get rid of parentheses

7b-8b-15+12=0

We add all the numbers together, and all the variables

-1b-3=0

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

-b=3

b=3/-1

b=-3

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