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3y-4.2y=4.8
We move all terms to the left:
3y-4.2y-(4.8)=0
We add all the numbers together, and all the variables
-1.2y-4.8=0
We move all terms containing y to the left, all other terms to the right
-1.2y=4.8
y=4.8/-1.2
y=-4
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