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x^3*((18*x^6-(14*x^4))/2) = 0
x^3*((18*x^6-14*x^4)/2) = 0
(x^3*(18*x^6-14*x^4))/2 = 0
18*x^6-14*x^4 = 0
2*x^4*(9*x^2-7) = 0
9*x^2 = 7 // : 9
x^2 = 7/9
x^2 = 7/9 // ^ 1/2
abs(x) = (7/9)^(1/2)
x = (7/9)^(1/2) or x = -(7/9)^(1/2)
2*x^4*(x-(7/9)^(1/2))*(x+(7/9)^(1/2)) = 0
(2*x^3*x^4*(x-(7/9)^(1/2))*(x+(7/9)^(1/2)))/2 = 0
( 2*x^4 )
2*x^4 = 0 // : 2
x^4 = 0
x = 0
( x+(7/9)^(1/2) )
x+(7/9)^(1/2) = 0 // - (7/9)^(1/2)
x = -(7/9)^(1/2)
( x-(7/9)^(1/2) )
x-(7/9)^(1/2) = 0 // + (7/9)^(1/2)
x = (7/9)^(1/2)
( x^3 )
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in { 0, -(7/9)^(1/2), (7/9)^(1/2), 0 }
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