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m in (-oo:+oo)
m/(-0.19) = 12 // - 12
m/(-0.19)-12 = 0
-5.26315789*m-12 = 0 // + 12
-5.26315789*m = 12 // : -5.26315789
m = 12/(-5.26315789)
m = -2.28
m = -2.28
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