4b+12=b-15

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Solution for 4b+12=b-15 equation: 



4b+12=b-15

We move all terms to the left:

4b+12-(b-15)=0

We get rid of parentheses

4b-b+15+12=0

We add all the numbers together, and all the variables

3b+27=0

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

3b=-27

b=-27/3

b=-9

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