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z in (-oo:+oo)
(3/8)*(z-(3/4)) = (3/4)*(z-(2/5)) // - (3/4)*(z-(2/5))
(3/8)*(z-(3/4))-((3/4)*(z-(2/5))) = 0
(3/8)*(z-3/4)+(-3/4)*(z-2/5) = 0
3/8*(z-3/4)-3/4*(z-2/5) = 0
3/8*(z-3/4)-3/4*(z-2/5) = 0
3/160-3/8*z = 0
3/160-3/8*z = 0
3/160-3/8*z = 0 // - 3/160
-3/8*z = -3/160 // : -3/8
z = -3/160/(-3/8)
z = 1/20
z = 1/20
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