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z in (-oo:+oo)
1.6/0.9 = z/7.9 // - z/7.9
1.6/0.9-(z/7.9) = 0
1.6/0.9-0.12658228*z = 0
1.77777778-0.12658228*z = 0 // - 1.77777778
-0.12658228*z = -1.77777778 // : -0.12658228
z = -1.77777778/(-0.12658228)
z = 14.04444429
z = 14.04444429
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