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x in (-oo:+oo)
(X/5)*x^2 = 120 // - 120
(X/5)*x^2-120 = 0
1/5*X*x^2 = 120 // : 1/5*X
x^2 = 600*X^-1
x^2 = 600*X^-1 // ^ 1/2
abs(x) = 10*6^(1/2)*X^(-1/2)
x = 10*6^(1/2)*X^(-1/2) or x = -(10*6^(1/2)*X^(-1/2))
x in { 10*6^(1/2)*X^(-1/2), -(10*6^(1/2)*X^(-1/2)) }
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