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7(s-5)-2=40
We move all terms to the left:
7(s-5)-2-(40)=0
We add all the numbers together, and all the variables
7(s-5)-42=0
We multiply parentheses
7s-35-42=0
We add all the numbers together, and all the variables
7s-77=0
We move all terms containing s to the left, all other terms to the right
7s=77
s=77/7
s=11
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