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z in (-oo:+oo)
6.2 = z/7.1 // - z/7.1
6.2-(z/7.1) = 0
6.2-0.14084507*z = 0
6.2-0.14084507*z = 0 // - 6.2
-0.14084507*z = -6.2 // : -0.14084507
z = -6.2/(-0.14084507)
z = 44.02000013
z = 44.02000013
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