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