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z in (-oo:+oo)
(7/8)*z-1 = (-15/16)*z+4 // - (-15/16)*z+4
(7/8)*z-((-15/16)*z)-4-1 = 0
(7/8)*z+(15/16)*z-4-1 = 0
29/16*z-5 = 0 // + 5
29/16*z = 5 // : 29/16
z = 5/29/16
z = 80/29
z = 80/29
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