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3=y-1+2y
We move all terms to the left:
3-(y-1+2y)=0
We add all the numbers together, and all the variables
-(3y-1)+3=0
We get rid of parentheses
-3y+1+3=0
We add all the numbers together, and all the variables
-3y+4=0
We move all terms containing y to the left, all other terms to the right
-3y=-4
y=-4/-3
y=1+1/3
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