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20-3s+3=2s-12=
We move all terms to the left:
20-3s+3-(2s-12)=0
We add all the numbers together, and all the variables
-3s-(2s-12)+23=0
We get rid of parentheses
-3s-2s+12+23=0
We add all the numbers together, and all the variables
-5s+35=0
We move all terms containing s to the left, all other terms to the right
-5s=-35
s=-35/-5
s=+7
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