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y+12=2y-5.3
We move all terms to the left:
y+12-(2y-5.3)=0
We get rid of parentheses
y-2y+5.3+12=0
We add all the numbers together, and all the variables
-1y+17.3=0
We move all terms containing y to the left, all other terms to the right
-y=-17.3
y=-17.3/-1
y=17+0.3/1
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