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10s=7+9s
We move all terms to the left:
10s-(7+9s)=0
We add all the numbers together, and all the variables
10s-(9s+7)=0
We get rid of parentheses
10s-9s-7=0
We add all the numbers together, and all the variables
s-7=0
We move all terms containing s to the left, all other terms to the right
s=7
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