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8/4-(6*x^3)-4 = 0
8/4-6*x^3-4 = 0
-6*x^3 = 2 // : -6
x^3 = -1/3
x^3 = -1/3 // ^ 1/3
x = -(1/3)^(1/3)
x = -(1/3)^(1/3)
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