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4*x^9 = 30-(k/16) // - 30-(k/16)
k/16+4*x^9-30 = 0
4*x^9 = -(1/16*k-30) // : 4
x^9 = (30-(1/16*k))/4
x^9 = (30-1/16*k)/4 // ^ 1/9
x = ((30-1/16*k)^(1/9))/(4^(1/9))
x = ((30-1/16*k)^(1/9))/(4^(1/9))
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