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