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