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z in (-oo:+oo)
(1/9)*z+1 = (-8/9)*z // - (-8/9)*z
(1/9)*z-((-8/9)*z)+1 = 0
(1/9)*z+(8/9)*z+1 = 0
z+1 = 0 // - 1
z = -1
z = -1
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