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z in (-oo:+oo)
(5/7)*z+1/8 = (-2/7)*z+3/4 // - (-2/7)*z+3/4
(5/7)*z-((-2/7)*z)+1/8-(3/4) = 0
(5/7)*z+(2/7)*z+1/8-3/4 = 0
z-5/8 = 0 // + 5/8
z = 5/8
z = 5/8
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