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7=4s+9
We move all terms to the left:
7-(4s+9)=0
We get rid of parentheses
-4s-9+7=0
We add all the numbers together, and all the variables
-4s-2=0
We move all terms containing s to the left, all other terms to the right
-4s=2
s=2/-4
s=-1/2
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