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-4.2=y+9.3
We move all terms to the left:
-4.2-(y+9.3)=0
We get rid of parentheses
-y-9.3-4.2=0
We add all the numbers together, and all the variables
-1y-13.5=0
We move all terms containing y to the left, all other terms to the right
-y=13.5
y=13.5/-1
y=-13+0.5/1
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