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z in (-oo:+oo)
(-1/6)*(z-(1/2)) = (1/8)*(z-(1/5)) // - (1/8)*(z-(1/5))
(-1/6)*(z-(1/2))-((1/8)*(z-(1/5))) = 0
(-1/6)*(z-1/2)+(-1/8)*(z-1/5) = 0
-1/6*(z-1/2)-1/8*(z-1/5) = 0
-1/6*(z-1/2)-1/8*(z-1/5) = 0
13/120-7/24*z = 0
13/120-7/24*z = 0
13/120-7/24*z = 0 // - 13/120
-7/24*z = -13/120 // : -7/24
z = -13/120/(-7/24)
z = 13/35
z = 13/35
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