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86=15s+41
We move all terms to the left:
86-(15s+41)=0
We get rid of parentheses
-15s-41+86=0
We add all the numbers together, and all the variables
-15s+45=0
We move all terms containing s to the left, all other terms to the right
-15s=-45
s=-45/-15
s=+3
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