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z in (-oo:+oo)
(3/4)*z-1 = (-7/8)*z+4 // - (-7/8)*z+4
(3/4)*z-((-7/8)*z)-4-1 = 0
(3/4)*z+(7/8)*z-4-1 = 0
13/8*z-5 = 0 // + 5
13/8*z = 5 // : 13/8
z = 5/13/8
z = 40/13
z = 40/13
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