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z in (-oo:+oo)
(-4/9)*z = 16/45 // - 16/45
(-4/9)*z-(16/45) = 0
(-4/9)*z-16/45 = 0
-4/9*z-16/45 = 0 // + 16/45
-4/9*z = 16/45 // : -4/9
z = 16/45/(-4/9)
z = -4/5
z = -4/5
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