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(1*x^4)/5-((6*x^1)/7) = 0
(x^4)/5+(-6/7)*x = 0
1/5*x^4-6/7*x = 0
x*(1/5*x^3-6/7) = 0
1/5*x^3 = 6/7 // : 1/5
x^3 = 30/7
x^3 = 30/7 // ^ 1/3
x = (30/7)^(1/3)
x = 0
x = 0
x in { (30/7)^(1/3), 0 }
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