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/1.9 = 2.05 // - 2.05
d/1.9-2.05 = 0
0.52631579*d-2.05 = 0 // + 2.05
0.52631579*d = 2.05 // : 0.52631579
d = 2.05/0.52631579
d = 3.895
d = 3.895
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