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x in (-oo:+oo)
((4*x)/3.8)*x-20 = 0
1.05263158*x^2 = 20 // : 1.05263158
x^2 = 18.99999998
x^2 = 18.99999998 // ^ 1/2
abs(x) = 18.99999998^(1/2)
x = 18.99999998^(1/2) or x = -18.99999998^(1/2)
x in { 18.99999998^(1/2), -18.99999998^(1/2) }
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