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x in (-oo:+oo)
x*((35*x^3-(6*x))/7) = 0
x*((35*x^3-6*x)/7) = 0
(x*(35*x^3-6*x))/7 = 0
35*x^3-6*x = 0
x*(35*x^2-6) = 0
35*x^2 = 6 // : 35
x^2 = 6/35
x^2 = 6/35 // ^ 1/2
abs(x) = (6/35)^(1/2)
x = (6/35)^(1/2) or x = -(6/35)^(1/2)
x*(x-(6/35)^(1/2))*(x+(6/35)^(1/2)) = 0
(x^2*(x-(6/35)^(1/2))*(x+(6/35)^(1/2)))/7 = 0
( x+(6/35)^(1/2) )
x+(6/35)^(1/2) = 0 // - (6/35)^(1/2)
x = -(6/35)^(1/2)
( x-(6/35)^(1/2) )
x-(6/35)^(1/2) = 0 // + (6/35)^(1/2)
x = (6/35)^(1/2)
( x )
x = 0
x in { -(6/35)^(1/2), (6/35)^(1/2), 0, 0 }
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