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z in (-oo:+oo)
(-2/5)*(z-13)-((1/10)*z) = 0
(-2/5)*(z-13)+(-1/10)*z = 0
-2/5*(z-13)-z/10 = 0
(-2/5*10*(z-13))/10-z/10 = 0
-2/5*10*(z-13)-z = 0
52-5*z = 0
(52-5*z)/10 = 0
(52-5*z)/10 = 0 // * 10
52-5*z = 0
52-5*z = 0 // - 52
-5*z = -52 // : -5
z = -52/(-5)
z = 52/5
z = 52/5
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