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z in (-oo:+oo)
(-1/9)*(z-(1/8)) = (-1/8)*(z+1/5) // - (-1/8)*(z+1/5)
(-1/9)*(z-(1/8))-((-1/8)*(z+1/5)) = 0
(-1/9)*(z-1/8)+(1/8)*(z+1/5) = 0
1/8*(z+1/5)-1/9*(z-1/8) = 0
1/8*(z+1/5)-1/9*(z-1/8) = 0
1/72*z+7/180 = 0
1/72*z+7/180 = 0
1/72*z+7/180 = 0 // - 7/180
1/72*z = -7/180 // : 1/72
z = -7/180/1/72
z = -14/5
z = -14/5
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