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2s-4=-4+2s
We move all terms to the left:
2s-4-(-4+2s)=0
We add all the numbers together, and all the variables
2s-(2s-4)-4=0
We get rid of parentheses
2s-2s+4-4=0
We add all the numbers together, and all the variables
=0
s=0/1
s=0
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