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3y-y^2-18=0
We add all the numbers together, and all the variables
-1y^2+3y-18=0
a = -1; b = 3; c = -18;
Δ = b2-4ac
Δ = 32-4·(-1)·(-18)
Δ = -63
Delta is less than zero, so there is no solution for the equation
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