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