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n in (-oo:+oo)
n/(-8.4) = -10.2 // + 10.2
n/(-8.4)+10.2 = 0
10.2-0.11904762*n = 0 // - 10.2
-0.11904762*n = -10.2 // : -0.11904762
n = -10.2/(-0.11904762)
n = 85.67999931
n = 85.67999931
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