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-20-3s=-7s+18-15s
We move all terms to the left:
-20-3s-(-7s+18-15s)=0
We add all the numbers together, and all the variables
-3s-(-22s+18)-20=0
We get rid of parentheses
-3s+22s-18-20=0
We add all the numbers together, and all the variables
19s-38=0
We move all terms containing s to the left, all other terms to the right
19s=38
s=38/19
s=2
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