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z in (-oo:+oo)
(2/9)*z+7/8 = (-7/9)*z+1/4 // - (-7/9)*z+1/4
(2/9)*z-((-7/9)*z)+7/8-(1/4) = 0
(2/9)*z+(7/9)*z+7/8-1/4 = 0
z+5/8 = 0 // - 5/8
z = -5/8
z = -5/8
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