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12-0.75s+0.50s=9
We move all terms to the left:
12-0.75s+0.50s-(9)=0
We add all the numbers together, and all the variables
-0.25s+3=0
We move all terms containing s to the left, all other terms to the right
-0.25s=-3
s=-3/-0.25
s=+12
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