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-2(s-6)=-12
We move all terms to the left:
-2(s-6)-(-12)=0
We add all the numbers together, and all the variables
-2(s-6)+12=0
We multiply parentheses
-2s+12+12=0
We add all the numbers together, and all the variables
-2s+24=0
We move all terms containing s to the left, all other terms to the right
-2s=-24
s=-24/-2
s=+12
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