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Z in (-oo:+oo)
(Z-7)/5 = -3 // + 3
(Z-7)/5+3 = 0
(Z-7)/5+(3*5)/5 = 0
Z+3*5-7 = 0
Z+8 = 0
(Z+8)/5 = 0
(Z+8)/5 = 0 // * 5
Z+8 = 0
Z+8 = 0 // - 8
Z = -8
Z = -8
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