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15y-10y-12=40.25
We move all terms to the left:
15y-10y-12-(40.25)=0
We add all the numbers together, and all the variables
5y-52.25=0
We move all terms containing y to the left, all other terms to the right
5y=52.25
y=52.25/5
y=10+2.25/5
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