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y=20+3y=66
We move all terms to the left:
y-(20+3y)=0
We add all the numbers together, and all the variables
y-(3y+20)=0
We get rid of parentheses
y-3y-20=0
We add all the numbers together, and all the variables
-2y-20=0
We move all terms containing y to the left, all other terms to the right
-2y=20
y=20/-2
y=-10
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