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(3/5)*x^2 = 54 // - 54
(3/5)*x^2-54 = 0
3/5*x^2 = 54 // : 3/5
x^2 = 90
x^2 = 90 // ^ 1/2
abs(x) = 3*10^(1/2)
x = 3*10^(1/2) or x = -(3*10^(1/2))
x in { 3*10^(1/2), -(3*10^(1/2)) }
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