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