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10+y=3y-20
We move all terms to the left:
10+y-(3y-20)=0
We get rid of parentheses
y-3y+20+10=0
We add all the numbers together, and all the variables
-2y+30=0
We move all terms containing y to the left, all other terms to the right
-2y=-30
y=-30/-2
y=+15
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