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x in (-oo:+oo)
12*x^6-(x^3*((27*x^4)/3)) = 0
12*x^6-9*x^7 = 0
12*x^6-9*x^7 = 0
3*x^6*(4-3*x) = 0
4-3*x = 0 // - 4
-3*x = -4 // : -3
x = -4/(-3)
x = 4/3
3*x^6 = 0
3*x^6 = 0 // : 3
x^6 = 0
x = 0
x in { 4/3, 0 }
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