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(7/9)*x^2*(7*x^6+(6/9)*z^8) = 0
7/9*x^2*(7*x^6+2/3*z^8) = 0
( 7*x^6+2/3*z^8 )
7*x^6 = -(2/3*z^8) // : 7
x^6 = -2/21*z^8
x^6 = -2/21*z^8 // ^ 1/6
abs(x) = (-2/21)^(1/6)*z^(4/3)
x = (-2/21)^(1/6)*z^(4/3) or x = -((-2/21)^(1/6)*z^(4/3))
( 7/9*x^2 )
7/9*x^2 = 0 // : 7/9
x^2 = 0
x = 0
x in { (-2/21)^(1/6)*z^(4/3), -((-2/21)^(1/6)*z^(4/3)), 0 }
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