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x2-5x=-20
We move all terms to the left:
x2-5x-(-20)=0
We add all the numbers together, and all the variables
x^2-5x+20=0
a = 1; b = -5; c = +20;
Δ = b2-4ac
Δ = -52-4·1·20
Δ = -55
Delta is less than zero, so there is no solution for the equation
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