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28=5s+2s
We move all terms to the left:
28-(5s+2s)=0
We add all the numbers together, and all the variables
-(+7s)+28=0
We get rid of parentheses
-7s+28=0
We move all terms containing s to the left, all other terms to the right
-7s=-28
s=-28/-7
s=+4
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