12b+27=-18-3b

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Solution for 12b+27=-18-3b equation: 



12b+27=-18-3b

We move all terms to the left:

12b+27-(-18-3b)=0

We add all the numbers together, and all the variables

12b-(-3b-18)+27=0

We get rid of parentheses

12b+3b+18+27=0

We add all the numbers together, and all the variables

15b+45=0

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

15b=-45

b=-45/15

b=-3

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