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36-(((6*x^3)/18)*x^3) = 0
(-1/3)*x^6+36 = 0
-1/3*x^6 = -36 // : -1/3
x^6 = 108
x^6 = 108 // ^ 1/6
abs(x) = 108^(1/6)
x = 108^(1/6) or x = -108^(1/6)
x in { 108^(1/6), -108^(1/6) }
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