If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
(((3*x^4)^3*z^2)/3)*z^5 = 0
9*x^12*z^7 = 0 // : 9*z^7
x^12 = 0
x = 0
x = 0
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