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z in (-oo:+oo)
(-4/9)*z = 8/27 // - 8/27
(-4/9)*z-(8/27) = 0
(-4/9)*z-8/27 = 0
-4/9*z-8/27 = 0 // + 8/27
-4/9*z = 8/27 // : -4/9
z = 8/27/(-4/9)
z = -2/3
z = -2/3
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