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z in (-oo:+oo)
(-1/9)*(z-(1/5)) = (1/5)*(z-(1/9)) // - (1/5)*(z-(1/9))
(-1/9)*(z-(1/5))-((1/5)*(z-(1/9))) = 0
(-1/9)*(z-1/5)+(-1/5)*(z-1/9) = 0
-1/9*(z-1/5)-1/5*(z-1/9) = 0
-1/9*(z-1/5)-1/5*(z-1/9) = 0
2/45-14/45*z = 0
2/45-14/45*z = 0
2/45-14/45*z = 0 // - 2/45
-14/45*z = -2/45 // : -14/45
z = -2/45/(-14/45)
z = 1/7
z = 1/7
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