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/y = 10000-x // - 10000-x
x+1/y-10000 = 0
x+y^-1-10000 = 0 // - y^-1-10000
x = -(y^-1-10000)
x = 10000-y^-1
x = 10000-y^-1
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