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x in (-oo:+oo)
z = (x-m)/s // - (x-m)/s
z-((x-m)/s) = 0
(-1*(x-m))/s+z = 0
(-1*(x-m))/s+(s*z)/s = 0
s*z-1*(x-m) = 0
m+s*z-x = 0
(m+s*z-x)/s = 0
(m+s*z-x)/s = 0 // * s
m+s*z-x = 0
m+s*z-x = 0 // - m+s*z
-x = -(m+s*z) // * -1
x = m+s*z
x = m+s*z
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