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17.5=0.8y+15.5
We move all terms to the left:
17.5-(0.8y+15.5)=0
We get rid of parentheses
-0.8y-15.5+17.5=0
We add all the numbers together, and all the variables
-0.8y+2=0
We move all terms containing y to the left, all other terms to the right
-0.8y=-2
y=-2/-0.8
y=2+0.4/0.8
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