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-5.6=y+3.9
We move all terms to the left:
-5.6-(y+3.9)=0
We get rid of parentheses
-y-3.9-5.6=0
We add all the numbers together, and all the variables
-1y-9.5=0
We move all terms containing y to the left, all other terms to the right
-y=9.5
y=9.5/-1
y=-9+0.5/1
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