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5x(x-2)=-20
We move all terms to the left:
5x(x-2)-(-20)=0
We add all the numbers together, and all the variables
5x(x-2)+20=0
We multiply parentheses
5x^2-10x+20=0
a = 5; b = -10; c = +20;
Δ = b2-4ac
Δ = -102-4·5·20
Δ = -300
Delta is less than zero, so there is no solution for the equation
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