7s-12s-2s=-9

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Solution for 7s-12s-2s=-9 equation: 



7s-12s-2s=-9

We move all terms to the left:

7s-12s-2s-(-9)=0

We add all the numbers together, and all the variables

-7s+9=0

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

-7s=-9

s=-9/-7

s=1+2/7

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