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z in (-oo:+oo)
7 = z/8.2 // - z/8.2
7-(z/8.2) = 0
7-0.12195122*z = 0
7-0.12195122*z = 0 // - 7
-0.12195122*z = -7 // : -0.12195122
z = -7/(-0.12195122)
z = 57.39999977
z = 57.39999977
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