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4-2y=7y+12
We move all terms to the left:
4-2y-(7y+12)=0
We get rid of parentheses
-2y-7y-12+4=0
We add all the numbers together, and all the variables
-9y-8=0
We move all terms containing y to the left, all other terms to the right
-9y=8
y=8/-9
y=-8/9
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