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z in (-oo:+oo)
(z-8)/6 = -4 // + 4
(z-8)/6+4 = 0
(z-8)/6+(4*6)/6 = 0
z+4*6-8 = 0
z+16 = 0
(z+16)/6 = 0
(z+16)/6 = 0 // * 6
z+16 = 0
z+16 = 0 // - 16
z = -16
z = -16
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