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12.5=0.8y
We move all terms to the left:
12.5-(0.8y)=0
We add all the numbers together, and all the variables
-(+0.8y)+12.5=0
We get rid of parentheses
-0.8y+12.5=0
We move all terms containing y to the left, all other terms to the right
-0.8y=-12.5
y=-12.5/-0.8
y=15+0.5/0.8
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