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