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36=8s+4s
We move all terms to the left:
36-(8s+4s)=0
We add all the numbers together, and all the variables
-(+12s)+36=0
We get rid of parentheses
-12s+36=0
We move all terms containing s to the left, all other terms to the right
-12s=-36
s=-36/-12
s=+3
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