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x in (-oo:+oo)
((20*x)/15)*x = 30 // - 30
((20*x)/15)*x-30 = 0
4/3*x^2 = 30 // : 4/3
x^2 = 45/2
x^2 = 45/2 // ^ 1/2
abs(x) = (45/2)^(1/2)
x = (45/2)^(1/2) or x = -(45/2)^(1/2)
x in { (45/2)^(1/2), -(45/2)^(1/2) }
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