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10+30=0.8y
We move all terms to the left:
10+30-(0.8y)=0
We add all the numbers together, and all the variables
-(+0.8y)+10+30=0
We add all the numbers together, and all the variables
-(+0.8y)+40=0
We get rid of parentheses
-0.8y+40=0
We move all terms containing y to the left, all other terms to the right
-0.8y=-40
y=-40/-0.8
y=+50
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