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15*x^7-(x^3*((3*x^4)/3))-(24*x^5) = 0
15*x^7-x^7-24*x^5 = 0
14*x^7-24*x^5 = 0
2*x^5*(7*x^2-12) = 0
7*x^2 = 12 // : 7
x^2 = 12/7
x^2 = 12/7 // ^ 1/2
abs(x) = (12/7)^(1/2)
x = (12/7)^(1/2) or x = -(12/7)^(1/2)
2*x^5 = 0
2*x^5 = 0 // : 2
x^5 = 0
x = 0
x in { (12/7)^(1/2), -(12/7)^(1/2), 0 }
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