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Z in (-oo:+oo)
(Z-5)/6 = -2 // + 2
(Z-5)/6+2 = 0
(Z-5)/6+(2*6)/6 = 0
Z+2*6-5 = 0
Z+7 = 0
(Z+7)/6 = 0
(Z+7)/6 = 0 // * 6
Z+7 = 0
Z+7 = 0 // - 7
Z = -7
Z = -7
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