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z in (-oo:+oo)
42/23 = 6*z // - 6*z
42/23-(6*z) = 0
42/23-6*z = 0
42/23-6*z = 0 // - 42/23
-6*z = -42/23 // : -6
z = -42/23/(-6)
z = 7/23
z = 7/23
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