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z in (-oo:+oo)
(7/8)*z = 1/4 // - 1/4
(7/8)*z-(1/4) = 0
(7/8)*z-1/4 = 0
7/8*z-1/4 = 0 // + 1/4
7/8*z = 1/4 // : 7/8
z = 1/4/7/8
z = 2/7
z = 2/7
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