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z in (-oo:+oo)
(-1/6)*(z-(3/4)) = (1/5)*(z-(1/5)) // - (1/5)*(z-(1/5))
(-1/6)*(z-(3/4))-((1/5)*(z-(1/5))) = 0
(-1/6)*(z-3/4)+(-1/5)*(z-1/5) = 0
-1/6*(z-3/4)-1/5*(z-1/5) = 0
-1/6*(z-3/4)-1/5*(z-1/5) = 0
33/200-11/30*z = 0
33/200-11/30*z = 0
33/200-11/30*z = 0 // - 33/200
-11/30*z = -33/200 // : -11/30
z = -33/200/(-11/30)
z = 9/20
z = 9/20
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