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z in (-oo:+oo)
(1/6)*(z-(1/5)) = (-1/5)*(z-(2/3)) // - (-1/5)*(z-(2/3))
(1/6)*(z-(1/5))-((-1/5)*(z-(2/3))) = 0
(1/6)*(z-1/5)+(1/5)*(z-2/3) = 0
1/6*(z-1/5)+1/5*(z-2/3) = 0
1/6*(z-1/5)+1/5*(z-2/3) = 0
11/30*z-1/6 = 0
11/30*z-1/6 = 0
11/30*z-1/6 = 0 // + 1/6
11/30*z = 1/6 // : 11/30
z = 1/6/11/30
z = 5/11
z = 5/11
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