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((2*x)/20)*x^2-(2*x) = 0
((2*x)/20)*x^2-2*x = 0
1/10*x^3-2*x = 0
x*(1/10*x^2-2) = 0
1/10*x^2 = 2 // : 1/10
x^2 = 20
x^2 = 20 // ^ 1/2
abs(x) = 2*5^(1/2)
x = 2*5^(1/2) or x = -(2*5^(1/2))
x = 0
x = 0
x in { 2*5^(1/2), -(2*5^(1/2)), 0 }
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