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m in (-oo:+oo)
7/2 = m/3.8 // - m/3.8
7/2-(m/3.8) = 0
7/2-0.26315789*m = 0
7/2-0.26315789*m = 0 // - 7/2
-0.26315789*m = -7/2 // : -0.26315789
m = -7/2/(-0.26315789)
m = 13.30000024
m = 13.30000024
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