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40^3+14x^2-12x=0
We add all the numbers together, and all the variables
14x^2-12x+64000=0
a = 14; b = -12; c = +64000;
Δ = b2-4ac
Δ = -122-4·14·64000
Δ = -3583856
Delta is less than zero, so there is no solution for the equation
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