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-4s+5=-2s-9
We move all terms to the left:
-4s+5-(-2s-9)=0
We get rid of parentheses
-4s+2s+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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