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