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7s+5=-9+9s
We move all terms to the left:
7s+5-(-9+9s)=0
We add all the numbers together, and all the variables
7s-(9s-9)+5=0
We get rid of parentheses
7s-9s+9+5=0
We add all the numbers together, and all the variables
-2s+14=0
We move all terms containing s to the left, all other terms to the right
-2s=-14
s=-14/-2
s=+7
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