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12=4y+18
We move all terms to the left:
12-(4y+18)=0
We get rid of parentheses
-4y-18+12=0
We add all the numbers together, and all the variables
-4y-6=0
We move all terms containing y to the left, all other terms to the right
-4y=6
y=6/-4
y=-1+1/2
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