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55=7s-9
We move all terms to the left:
55-(7s-9)=0
We get rid of parentheses
-7s+9+55=0
We add all the numbers together, and all the variables
-7s+64=0
We move all terms containing s to the left, all other terms to the right
-7s=-64
s=-64/-7
s=9+1/7
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