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z in (-oo:+oo)
6 = z/8.4 // - z/8.4
6-(z/8.4) = 0
6-0.11904762*z = 0
6-0.11904762*z = 0 // - 6
-0.11904762*z = -6 // : -0.11904762
z = -6/(-0.11904762)
z = 50.3999996
z = 50.3999996
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