12+4b=b-3

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Solution for 12+4b=b-3 equation: 



12+4b=b-3

We move all terms to the left:

12+4b-(b-3)=0

We get rid of parentheses

4b-b+3+12=0

We add all the numbers together, and all the variables

3b+15=0

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

3b=-15

b=-15/3

b=-5

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