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3y-10=4y-20
We move all terms to the left:
3y-10-(4y-20)=0
We get rid of parentheses
3y-4y+20-10=0
We add all the numbers together, and all the variables
-1y+10=0
We move all terms containing y to the left, all other terms to the right
-y=-10
y=-10/-1
y=+10
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