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x in (-oo:+oo)
x^3-(12/4) = 13 // - 13
x^3-(12/4)-13 = 0
x^3-13-3 = 0
1*x^3 = 16 // : 1
x^3 = 16
x^3 = 16 // ^ 1/3
x = 2*2^(1/3)
x = 2*2^(1/3)
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