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12.5y+4=3y-15
We move all terms to the left:
12.5y+4-(3y-15)=0
We get rid of parentheses
12.5y-3y+15+4=0
We add all the numbers together, and all the variables
9.5y+19=0
We move all terms containing y to the left, all other terms to the right
9.5y=-19
y=-19/9.5
y=-2
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