If it's not what You are looking for type in the equation solver your own equation and let us solve it.
n in (-oo:+oo)
n-(12.9/6.1) = 0.377 // - 0.377
n-(12.9/6.1)-0.377 = 0
n-2.1147541-0.377 = 0
n-2.4917541 = 0 // + 2.4917541
n = 2.4917541
n = 2.4917541
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