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6*x^7-(1*8*x^4)-(((20*x^2)/2)*x^2) = 0
6*x^7-8*x^4-10*x^4 = 0
6*x^7-18*x^4 = 0
6*x^4*(x^3-3) = 0
1*x^3 = 3 // : 1
x^3 = 3
x^3 = 3 // ^ 1/3
x = 3^(1/3)
6*x^4 = 0
6*x^4 = 0 // : 6
x^4 = 0
x = 0
x in { 3^(1/3), 0 }
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