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4y-10=y+20
We move all terms to the left:
4y-10-(y+20)=0
We get rid of parentheses
4y-y-20-10=0
We add all the numbers together, and all the variables
3y-30=0
We move all terms containing y to the left, all other terms to the right
3y=30
y=30/3
y=10
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