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320.4=8.9y
We move all terms to the left:
320.4-(8.9y)=0
We add all the numbers together, and all the variables
-(+8.9y)+320.4=0
We get rid of parentheses
-8.9y+320.4=0
We move all terms containing y to the left, all other terms to the right
-8.9y=-320.4
y=-320.4/-8.9
y=35+1/1
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