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x in (-oo:+oo)
x/2.1 = y/3.8 // - y/3.8
x/2.1-(y/3.8) = 0
x/2.1-0.26315789*y = 0
0.47619048*x-0.26315789*y = 0 // + -0.26315789*y
0.47619048*x = -(-0.26315789*y) // : 0.47619048
x = (-(-0.26315789*y))/0.47619048
x = 0.55263156*y
x = 0.55263156*y
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