If it's not what You are looking for type in the equation solver your own equation and let us solve it.
d in (-oo:+oo)
d/3.8 = 7.5 // - 7.5
d/3.8-7.5 = 0
0.26315789*d-7.5 = 0 // + 7.5
0.26315789*d = 7.5 // : 0.26315789
d = 7.5/0.26315789
d = 28.50000051
d = 28.50000051
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