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4y=0.8y-6.4
We move all terms to the left:
4y-(0.8y-6.4)=0
We get rid of parentheses
4y-0.8y+6.4=0
We add all the numbers together, and all the variables
3.2y+6.4=0
We move all terms containing y to the left, all other terms to the right
3.2y=-6.4
y=-6.4/3.2
y=-2
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