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0.1y=0.2y-7
We move all terms to the left:
0.1y-(0.2y-7)=0
We get rid of parentheses
0.1y-0.2y+7=0
We add all the numbers together, and all the variables
-0.1y+7=0
We move all terms containing y to the left, all other terms to the right
-0.1y=-7
y=-7/-0.1
y=+70
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