12=-s-2s

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Solution for 12=-s-2s equation: 



12=-s-2s

We move all terms to the left:

12-(-s-2s)=0

We add all the numbers together, and all the variables

-(-3s)+12=0

We get rid of parentheses

3s+12=0

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

3s=-12

s=-12/3

s=-4

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