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