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z in (-oo:+oo)
(4*z)/(-16) = 16 // - 16
(4*z)/(-16)-16 = 0
-1/4*z-16 = 0 // + 16
-1/4*z = 16 // : -1/4
z = 16/(-1/4)
z = -64
z = -64
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