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x in (-oo:+oo)
((4*x)/5)*x = 72/3 // - 72/3
((4*x)/5)*x-(72/3) = 0
((4*x)/5)*x-24 = 0
4/5*x^2 = 24 // : 4/5
x^2 = 30
x^2 = 30 // ^ 1/2
abs(x) = 30^(1/2)
x = 30^(1/2) or x = -30^(1/2)
x in { 30^(1/2), -30^(1/2) }
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