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)
1/500+1/500 = x // - x
1/500-x+1/500 = 0
1/250-x = 0 // - 1/250
-x = -1/250 // * -1
x = 1/250
x = 1/250
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