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-4.2=y-6.6
We move all terms to the left:
-4.2-(y-6.6)=0
We get rid of parentheses
-y+6.6-4.2=0
We add all the numbers together, and all the variables
-1y+2.4=0
We move all terms containing y to the left, all other terms to the right
-y=-2.4
y=-2.4/-1
y=2+0.4/1
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