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x in (-oo:+oo)
((x/2)*x)/3 = 5 // - 5
((x/2)*x)/3-5 = 0
1/6*x^2 = 5 // : 1/6
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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