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z in (-oo:+oo)
15/9 = 8*z // - 8*z
15/9-(8*z) = 0
15/9-8*z = 0
5/3-8*z = 0 // - 5/3
-8*z = -5/3 // : -8
z = -5/3/(-8)
z = 5/24
z = 5/24
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