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50=-7s-3s
We move all terms to the left:
50-(-7s-3s)=0
We add all the numbers together, and all the variables
-(-10s)+50=0
We get rid of parentheses
10s+50=0
We move all terms containing s to the left, all other terms to the right
10s=-50
s=-50/10
s=-5
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