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7+s-9s=-7s+4
We move all terms to the left:
7+s-9s-(-7s+4)=0
We add all the numbers together, and all the variables
-8s-(-7s+4)+7=0
We get rid of parentheses
-8s+7s-4+7=0
We add all the numbers together, and all the variables
-1s+3=0
We move all terms containing s to the left, all other terms to the right
-s=-3
s=-3/-1
s=+3
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