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-72=-9s-45
We move all terms to the left:
-72-(-9s-45)=0
We get rid of parentheses
9s+45-72=0
We add all the numbers together, and all the variables
9s-27=0
We move all terms containing s to the left, all other terms to the right
9s=27
s=27/9
s=3
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