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-2y-21=4y+3
We move all terms to the left:
-2y-21-(4y+3)=0
We get rid of parentheses
-2y-4y-3-21=0
We add all the numbers together, and all the variables
-6y-24=0
We move all terms containing y to the left, all other terms to the right
-6y=24
y=24/-6
y=-4
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