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x in (-oo:+oo)
24*x^6-(x^2*((21*x^5)/3)) = 0
24*x^6-7*x^7 = 0
24*x^6-7*x^7 = 0
x^6*(24-7*x) = 0
24-7*x = 0 // - 24
-7*x = -24 // : -7
x = -24/(-7)
x = 24/7
x^6 = 0
1*x^6 = 0 // : 1
x^6 = 0
x = 0
x in { 24/7, 0 }
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