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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
30-5/8*z = 0 // - 30
-5/8*z = -30 // : -5/8
z = -30/(-5/8)
z = 48
z = 48
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