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x in (-oo:+oo)
x*((1*x*x)/2) = 864 // - 864
x*((1*x*x)/2)-864 = 0
x*((x*x)/2)-864 = 0
1/2*x^3 = 864 // : 1/2
x^3 = 1728
x^3 = 1728 // ^ 1/3
x = 12
x = 12
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