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