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12=s+2.25
We move all terms to the left:
12-(s+2.25)=0
We get rid of parentheses
-s-2.25+12=0
We add all the numbers together, and all the variables
-1s+9.75=0
We move all terms containing s to the left, all other terms to the right
-s=-9.75
s=-9.75/-1
s=9+0.75/1
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