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x in (-oo:+oo)
16*x^5-(x^2*((36*x^4)/4)) = 0
16*x^5-9*x^6 = 0
16*x^5-9*x^6 = 0
x^5*(16-9*x) = 0
16-9*x = 0 // - 16
-9*x = -16 // : -9
x = -16/(-9)
x = 16/9
x^5 = 0
1*x^5 = 0 // : 1
x^5 = 0
x = 0
x in { 16/9, 0 }
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