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z in (-oo:+oo)
(-5/9)*z = 10/27 // - 10/27
(-5/9)*z-(10/27) = 0
(-5/9)*z-10/27 = 0
-5/9*z-10/27 = 0 // + 10/27
-5/9*z = 10/27 // : -5/9
z = 10/27/(-5/9)
z = -2/3
z = -2/3
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