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z in (-oo:+oo)
-(z-((8/20)*z^3)) = (18/16)*z^3-((6/16)*z^3) // - (18/16)*z^3-((6/16)*z^3)
(8/20)*z^3+(6/16)*z^3-((18/16)*z^3)-z = 0
(8/20)*z^3+(6/16)*z^3+(-9/8)*z^3-z = 0
-7/20*z^3-z = 0
-z*(7/20*z^2+1) = 0
7/20*z^2 = -1 // : 7/20
z^2 = -20/7
-z = 0
-1*z = 0 // : -1
z = 0
z = 0
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