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z in (-oo:+oo)
(-3/4)*(z-6-1) = (-1/8)*(z-(2/3)) // - (-1/8)*(z-(2/3))
(-3/4)*(z-6-1)-((-1/8)*(z-(2/3))) = 0
(-3/4)*(z-6-1)+(1/8)*(z-2/3) = 0
1/8*(z-2/3)-3/4*(z-7) = 0
1/8*(z-2/3)-3/4*(z-7) = 0
31/6-5/8*z = 0
31/6-5/8*z = 0
31/6-5/8*z = 0 // - 31/6
-5/8*z = -31/6 // : -5/8
z = -31/6/(-5/8)
z = 124/15
z = 124/15
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