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z in (-oo:+oo)
(2/9)*z-(3/4) = (-1/6)*z-(5/4) // - (-1/6)*z-(5/4)
(2/9)*z-((-1/6)*z)-(3/4)+5/4 = 0
(2/9)*z+(1/6)*z-3/4+5/4 = 0
7/18*z+1/2 = 0 // - 1/2
7/18*z = -1/2 // : 7/18
z = -1/2/7/18
z = -9/7
z = -9/7
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