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z in (-oo:+oo)
12 = 5*(z-(1/5)) // - 5*(z-(1/5))
12-(5*(z-(1/5))) = 0
12-5*(z-1/5) = 0
12-5*(z-1/5) = 0
13-5*z = 0
13-5*z = 0
13-5*z = 0 // - 13
-5*z = -13 // : -5
z = -13/(-5)
z = 13/5
z = 13/5
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