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x in (-oo:+oo)
14*x^6-(x^2*((6*x^5)/2)) = 0
14*x^6-3*x^7 = 0
14*x^6-3*x^7 = 0
x^6*(14-3*x) = 0
14-3*x = 0 // - 14
-3*x = -14 // : -3
x = -14/(-3)
x = 14/3
x^6 = 0
1*x^6 = 0 // : 1
x^6 = 0
x = 0
x in { 14/3, 0 }
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