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/2.1 = 12 // - 12
n/2.1-12 = 0
0.47619048*n-12 = 0 // + 12
0.47619048*n = 12 // : 0.47619048
n = 12/0.47619048
n = 25.1999998
n = 25.1999998
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