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n in (-oo:+oo)
1/0.19 = 12*n // - 12*n
1/0.19-(12*n) = 0
1/0.19-12*n = 0
5.26315789-12*n = 0 // - 5.26315789
-12*n = -5.26315789 // : -12
n = -5.26315789/(-12)
n = 0.43859649
n = 0.43859649
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