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x in (-oo:+oo)
16*x^6-(x^2*((4*x^5)/2)) = 0
16*x^6-2*x^7 = 0
16*x^6-2*x^7 = 0
2*x^6*(8-x) = 0
8-x = 0 // - 8
-x = -8 // * -1
x = 8
2*x^6 = 0
2*x^6 = 0 // : 2
x^6 = 0
x = 0
x in { 8, 0 }
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