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z in (-oo:+oo)
1/9 = z/8 // - z/8
1/9-(z/8) = 0
1/9-1/8*z = 0 // - 1/9
-1/8*z = -1/9 // : -1/8
z = -1/9/(-1/8)
z = 8/9
z = 8/9
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