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12=2-s
We move all terms to the left:
12-(2-s)=0
We add all the numbers together, and all the variables
-(-1s+2)+12=0
We get rid of parentheses
1s-2+12=0
We add all the numbers together, and all the variables
s+10=0
We move all terms containing s to the left, all other terms to the right
s=-10
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