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x in (-oo:+oo)
18*x^6-(x^2*((14*x^5)/2)) = 0
18*x^6-7*x^7 = 0
18*x^6-7*x^7 = 0
x^6*(18-7*x) = 0
18-7*x = 0 // - 18
-7*x = -18 // : -7
x = -18/(-7)
x = 18/7
x^6 = 0
1*x^6 = 0 // : 1
x^6 = 0
x = 0
x in { 18/7, 0 }
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