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3y-50=y+30
We move all terms to the left:
3y-50-(y+30)=0
We get rid of parentheses
3y-y-30-50=0
We add all the numbers together, and all the variables
2y-80=0
We move all terms containing y to the left, all other terms to the right
2y=80
y=80/2
y=40
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