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/1.3 = 2.1 // - 2.1
d/1.3-2.1 = 0
0.76923077*d-2.1 = 0 // + 2.1
0.76923077*d = 2.1 // : 0.76923077
d = 2.1/0.76923077
d = 2.73
d = 2.73
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