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z in (-oo:+oo)
(-1/8)*(z-(1/6)) = (-3/8)*(z+1/6) // - (-3/8)*(z+1/6)
(-1/8)*(z-(1/6))-((-3/8)*(z+1/6)) = 0
(-1/8)*(z-1/6)+(3/8)*(z+1/6) = 0
3/8*(z+1/6)-1/8*(z-1/6) = 0
3/8*(z+1/6)-1/8*(z-1/6) = 0
1/4*z+1/12 = 0
1/4*z+1/12 = 0
1/4*z+1/12 = 0 // - 1/12
1/4*z = -1/12 // : 1/4
z = -1/12/1/4
z = -1/3
z = -1/3
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