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21*x^3-(x*((12*x^2)/3))-20 = 0
21*x^3-4*x^3-20 = 0
17*x^3 = 20 // : 17
x^3 = 20/17
x^3 = 20/17 // ^ 1/3
x = (20/17)^(1/3)
x = (20/17)^(1/3)
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