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=3Y^2+18
We move all terms to the left:
-(3Y^2+18)=0
We get rid of parentheses
-3Y^2-18=0
a = -3; b = 0; c = -18;
Δ = b2-4ac
Δ = 02-4·(-3)·(-18)
Δ = -216
Delta is less than zero, so there is no solution for the equation
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