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x in (-oo:+oo)
x/(-8.4)+7 = 20 // - 20
x/(-8.4)-20+7 = 0
-0.11904762*x-13 = 0 // + 13
-0.11904762*x = 13 // : -0.11904762
x = 13/(-0.11904762)
x = -109.19999913
x = -109.19999913
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