12-9s=30

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Solution for 12-9s=30 equation: 



12-9s=30

We move all terms to the left:

12-9s-(30)=0

We add all the numbers together, and all the variables

-9s-18=0

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

-9s=18

s=18/-9

s=-2

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