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x in (-oo:+oo)
(z-16)/y = -4 // + 4
(z-16)/y+4 = 0
(z-16)/y+(4*y)/y = 0
4*y+z-16 = 0
(4*y+z-16)/y = 0
(4*y+z-16)/y = 0 // * y
4*y+z-16 = 0
x belongs to the empty set
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