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28-(0.3y)=0.7y-(12)
We move all terms to the left:
28-(0.3y)-(0.7y-(12))=0
We add all the numbers together, and all the variables
-(+0.3y)-(0.7y-12)+28=0
We get rid of parentheses
-0.3y-0.7y+12+28=0
We add all the numbers together, and all the variables
-1y+40=0
We move all terms containing y to the left, all other terms to the right
-y=-40
y=-40/-1
y=+40
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