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z in (-oo:+oo)
(2/3)*(z-(1/5)) = (1/2)*(z-(4/5)) // - (1/2)*(z-(4/5))
(2/3)*(z-(1/5))-((1/2)*(z-(4/5))) = 0
(2/3)*(z-1/5)+(-1/2)*(z-4/5) = 0
2/3*(z-1/5)-1/2*(z-4/5) = 0
2/3*(z-1/5)-1/2*(z-4/5) = 0
1/6*z+4/15 = 0
1/6*z+4/15 = 0
1/6*z+4/15 = 0 // - 4/15
1/6*z = -4/15 // : 1/6
z = -4/15/1/6
z = -8/5
z = -8/5
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