3b+12b=-15

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Solution for 3b+12b=-15 equation: 



3b+12b=-15

We move all terms to the left:

3b+12b-(-15)=0

We add all the numbers together, and all the variables

15b+15=0

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

15b=-15

b=-15/15

b=-1

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