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x in (-oo:+oo)
x/8.4 = 21 // - 21
x/8.4-21 = 0
0.11904762*x-21 = 0 // + 21
0.11904762*x = 21 // : 0.11904762
x = 21/0.11904762
x = 176.39999859
x = 176.39999859
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