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z in (-oo:+oo)
(8/9)*z-(1/2) = (-2/3)*z+1/6 // - (-2/3)*z+1/6
(8/9)*z-((-2/3)*z)-(1/2)-(1/6) = 0
(8/9)*z+(2/3)*z-1/2-1/6 = 0
14/9*z-2/3 = 0 // + 2/3
14/9*z = 2/3 // : 14/9
z = 2/3/14/9
z = 3/7
z = 3/7
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