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x in (-oo:+oo)
6/9 = x/8.4 // - x/8.4
6/9-(x/8.4) = 0
6/9-0.11904762*x = 0
2/3-0.11904762*x = 0 // - 2/3
-0.11904762*x = -2/3 // : -0.11904762
x = -2/3/(-0.11904762)
x = 5.59999998
x = 5.59999998
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