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2=2s-4
We move all terms to the left:
2-(2s-4)=0
We get rid of parentheses
-2s+4+2=0
We add all the numbers together, and all the variables
-2s+6=0
We move all terms containing s to the left, all other terms to the right
-2s=-6
s=-6/-2
s=+3
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