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x^2+4x-5x+20=0
We add all the numbers together, and all the variables
x^2-1x+20=0
a = 1; b = -1; c = +20;
Δ = b2-4ac
Δ = -12-4·1·20
Δ = -79
Delta is less than zero, so there is no solution for the equation
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