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3.8=y-7.2
We move all terms to the left:
3.8-(y-7.2)=0
We get rid of parentheses
-y+7.2+3.8=0
We add all the numbers together, and all the variables
-1y+11=0
We move all terms containing y to the left, all other terms to the right
-y=-11
y=-11/-1
y=+11
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