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x in (-oo:+oo)
((X/240)*x^5)/1 = 10 // - 10
((X/240)*x^5)/1-10 = 0
(X/240)*x^5-10 = 0
1/240*X*x^5 = 10 // : 1/240*X
x^5 = 2400*X^-1
x^5 = 2400*X^-1 // ^ 1/5
x = 2*75^(1/5)*X^(-1/5)
x = 2*75^(1/5)*X^(-1/5)