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2(-3x^2+7x-42)=0
We multiply parentheses
-6x^2+14x-84=0
a = -6; b = 14; c = -84;
Δ = b2-4ac
Δ = 142-4·(-6)·(-84)
Δ = -1820
Delta is less than zero, so there is no solution for the equation
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