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x in (-oo:+oo)
x^3 = 2400/260 // - 2400/260
x^3-(2400/260) = 0
x^3-120/13 = 0
1*x^3 = 120/13 // : 1
x^3 = 120/13
x^3 = 120/13 // ^ 1/3
x = (120/13)^(1/3)
x = (120/13)^(1/3)
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