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x in (-oo:+oo)
(5*30*x*x)/8 = 28888 // - 28888
(5*30*x*x)/8-28888 = 0
75/4*x^2 = 28888 // : 75/4
x^2 = 115552/75
x^2 = 115552/75 // ^ 1/2
abs(x) = (115552/75)^(1/2)
x = (115552/75)^(1/2) or x = -(115552/75)^(1/2)
x in { (115552/75)^(1/2), -(115552/75)^(1/2) }
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