12s+18=-6s

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Solution for 12s+18=-6s equation: 



12s+18=-6s

We move all terms to the left:

12s+18-(-6s)=0

We get rid of parentheses

12s+6s+18=0

We add all the numbers together, and all the variables

18s+18=0

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

18s=-18

s=-18/18

s=-1

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