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8.5=1.7y+3.4
We move all terms to the left:
8.5-(1.7y+3.4)=0
We get rid of parentheses
-1.7y-3.4+8.5=0
We add all the numbers together, and all the variables
-1.7y+5.1=0
We move all terms containing y to the left, all other terms to the right
-1.7y=-5.1
y=-5.1/-1.7
y=+3
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