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z in (-oo:+oo)
(2/9)*z-(5/8) = (-7/9)*z-(1/4) // - (-7/9)*z-(1/4)
(2/9)*z-((-7/9)*z)-(5/8)+1/4 = 0
(2/9)*z+(7/9)*z-5/8+1/4 = 0
z-3/8 = 0 // + 3/8
z = 3/8
z = 3/8
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