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-15=-18-s
We move all terms to the left:
-15-(-18-s)=0
We add all the numbers together, and all the variables
-(-1s-18)-15=0
We get rid of parentheses
1s+18-15=0
We add all the numbers together, and all the variables
s+3=0
We move all terms containing s to the left, all other terms to the right
s=-3
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