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4y=84-3y
We move all terms to the left:
4y-(84-3y)=0
We add all the numbers together, and all the variables
4y-(-3y+84)=0
We get rid of parentheses
4y+3y-84=0
We add all the numbers together, and all the variables
7y-84=0
We move all terms containing y to the left, all other terms to the right
7y=84
y=84/7
y=12
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