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z in (-oo:+oo)
6 = z/8.2 // - z/8.2
6-(z/8.2) = 0
6-0.12195122*z = 0
6-0.12195122*z = 0 // - 6
-0.12195122*z = -6 // : -0.12195122
z = -6/(-0.12195122)
z = 49.1999998
z = 49.1999998
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