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