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x in (-oo:+oo)
16*x^6-(x^2*((18*x^5)/2)) = 0
16*x^6-9*x^7 = 0
16*x^6-9*x^7 = 0
x^6*(16-9*x) = 0
16-9*x = 0 // - 16
-9*x = -16 // : -9
x = -16/(-9)
x = 16/9
x^6 = 0
1*x^6 = 0 // : 1
x^6 = 0
x = 0
x in { 16/9, 0 }
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