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s+12=2s+3
We move all terms to the left:
s+12-(2s+3)=0
We get rid of parentheses
s-2s-3+12=0
We add all the numbers together, and all the variables
-1s+9=0
We move all terms containing s to the left, all other terms to the right
-s=-9
s=-9/-1
s=+9
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