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9=4s-3
We move all terms to the left:
9-(4s-3)=0
We get rid of parentheses
-4s+3+9=0
We add all the numbers together, and all the variables
-4s+12=0
We move all terms containing s to the left, all other terms to the right
-4s=-12
s=-12/-4
s=+3
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