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/1000 = 0.823 // - 0.823
n/1000-0.823 = 0
1/1000*n-0.823 = 0 // + 0.823
1/1000*n = 0.823 // : 1/1000
n = 0.823/1/1000
n = 823
n = 823
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