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12*z^6-(((20*x^5)/4)*z^2) = 0
12*z^6-5*x^5*z^2 = 0
-5*x^5*z^2 = -(12*z^6) // : -5*z^2
x^5 = (12*z^4)/5
x^5 = (12*z^4)/5 // ^ 1/5
x = (12^(1/5)*z^(4/5))/(5^(1/5))
x = (12^(1/5)*z^(4/5))/(5^(1/5))
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