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X^3-((125/5)*x)-5 = 0
X^3-25*x-5 = 0
X^3-25*x-5 = 0 // - X^3-5
-25*x = -(X^3-5) // : -25
x = (-(X^3-5))/(-25)
x = (5-X^3)/(-25)
x = (5-X^3)/(-25)
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