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-12.7=-3.4y+8.6y
We move all terms to the left:
-12.7-(-3.4y+8.6y)=0
We add all the numbers together, and all the variables
-(+5.2y)-12.7=0
We get rid of parentheses
-5.2y-12.7=0
We move all terms containing y to the left, all other terms to the right
-5.2y=12.7
y=12.7/-5.2
y=-2+2.3/5.2
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