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b in (-oo:+oo)
1.8/1.9 = b/3.8 // - b/3.8
1.8/1.9-(b/3.8) = 0
1.8/1.9-0.26315789*b = 0
0.94736842-0.26315789*b = 0 // - 0.94736842
-0.26315789*b = -0.94736842 // : -0.26315789
b = -0.94736842/(-0.26315789)
b = 3.60000006
b = 3.60000006
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