If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
x/1000 = 0.251 // - 0.251
x/1000-0.251 = 0
1/1000*x-0.251 = 0 // + 0.251
1/1000*x = 0.251 // : 1/1000
x = 0.251/1/1000
x = 251
x = 251
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