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z in (-oo:+oo)
14*z^7-(z^3*((16*z^5)/2)) = 0
14*z^7-8*z^8 = 0
14*z^7-8*z^8 = 0
2*z^7*(7-4*z) = 0
7-4*z = 0 // - 7
-4*z = -7 // : -4
z = -7/(-4)
z = 7/4
2*z^7 = 0
2*z^7 = 0 // : 2
z^7 = 0
z = 0
z in { 7/4, 0 }
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