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z in (-oo:+oo)
19/20 = 18*z // - 18*z
19/20-(18*z) = 0
19/20-18*z = 0
19/20-18*z = 0 // - 19/20
-18*z = -19/20 // : -18
z = -19/20/(-18)
z = 19/360
z = 19/360
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