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z in (-oo:+oo)
7-((5/(-8))*z) = -23 // + 23
7-((5/(-8))*z)+23 = 0
(5/8)*z+7+23 = 0
5/8*z+30 = 0 // - 30
5/8*z = -30 // : 5/8
z = -30/5/8
z = -48
z = -48
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