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 = 0.16/40 // - 0.16/40
n-(0.16/40) = 0
n-0.004 = 0
n-0.004 = 0 // + 0.004
n = 0.004
n = 0.004
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