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7-s=-2s
We move all terms to the left:
7-s-(-2s)=0
We add all the numbers together, and all the variables
-1s-(-2s)+7=0
We get rid of parentheses
-1s+2s+7=0
We add all the numbers together, and all the variables
s+7=0
We move all terms containing s to the left, all other terms to the right
s=-7
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