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-0.1x^2+0.6x-0.9=0
a = -0.1; b = 0.6; c = -0.9;
Δ = b2-4ac
Δ = 0.62-4·(-0.1)·(-0.9)
Δ = -5.5511151231258E-17
Delta is less than zero, so there is no solution for the equation
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