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7-3s=s-4(2+5)
We move all terms to the left:
7-3s-(s-4(2+5))=0
We add all the numbers together, and all the variables
-3s-(s-47)+7=0
We get rid of parentheses
-3s-s+47+7=0
We add all the numbers together, and all the variables
-4s+54=0
We move all terms containing s to the left, all other terms to the right
-4s=-54
s=-54/-4
s=13+1/2
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