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12y=40+4y
We move all terms to the left:
12y-(40+4y)=0
We add all the numbers together, and all the variables
12y-(4y+40)=0
We get rid of parentheses
12y-4y-40=0
We add all the numbers together, and all the variables
8y-40=0
We move all terms containing y to the left, all other terms to the right
8y=40
y=40/8
y=5
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