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(4/1)*x^7-9*x = 0
4*x^7-9*x = 0
4*x^7-9*x = 0
x*(4*x^6-9) = 0
4*x^6 = 9 // : 4
x^6 = 9/4
x^6 = 9/4 // ^ 1/6
abs(x) = (9/4)^(1/6)
x = (9/4)^(1/6) or x = -(9/4)^(1/6)
x = 0
x = 0
x in { (9/4)^(1/6), -(9/4)^(1/6), 0 }
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