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)
z = x/s // - x/s
z-(x/s) = 0
z-s^-1*x = 0 // - z
-s^-1*x = -z // : -s^-1
x = -z/(-s^-1)
x = z/(s^-1)
x = z/(s^-1)
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