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/z = -z // + z
x/z+z = 0
x*z^-1+z = 0 // - z
x*z^-1 = -z // : z^-1
x = -z/(z^-1)
x = -z^2
x = -z^2
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