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3y=4-y
We move all terms to the left:
3y-(4-y)=0
We add all the numbers together, and all the variables
3y-(-1y+4)=0
We get rid of parentheses
3y+1y-4=0
We add all the numbers together, and all the variables
4y-4=0
We move all terms containing y to the left, all other terms to the right
4y=4
y=4/4
y=1
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