3s+12=-15

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Solution for 3s+12=-15 equation: 



3s+12=-15

We move all terms to the left:

3s+12-(-15)=0

We add all the numbers together, and all the variables

3s+27=0

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

3s=-27

s=-27/3

s=-9

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