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14*x^14+(-12/15)*(6+7)*x^4 = 0
14*x^14-52/5*x^4 = 0
2*x^4*(7*x^10-26/5) = 0
7*x^10 = 26/5 // : 7
x^10 = 26/35
x^10 = 26/35 // ^ 1/10
abs(x) = (26/35)^(1/10)
x = (26/35)^(1/10) or x = -(26/35)^(1/10)
2*x^4 = 0
2*x^4 = 0 // : 2
x^4 = 0
x = 0
x in { (26/35)^(1/10), -(26/35)^(1/10), 0 }
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