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/5.1 = 20.4 // - 20.4
n/5.1-20.4 = 0
0.19607843*n-20.4 = 0 // + 20.4
0.19607843*n = 20.4 // : 0.19607843
n = 20.4/0.19607843
n = 104.04000073
n = 104.04000073
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