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12y-5y-3y-4y+4y=12
We move all terms to the left:
12y-5y-3y-4y+4y-(12)=0
We add all the numbers together, and all the variables
4y-12=0
We move all terms containing y to the left, all other terms to the right
4y=12
y=12/4
y=3
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