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5 = 5/4-x^3 // - 5/4-x^3
x^3-(5/4)+5 = 0
x^3-5/4+5 = 0
1*x^3 = -15/4 // : 1
x^3 = -15/4
x^3 = -15/4 // ^ 1/3
x = -(15/4)^(1/3)
x = -(15/4)^(1/3)
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