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z in (-oo:+oo)
(-2/9)*z = 8/45 // - 8/45
(-2/9)*z-(8/45) = 0
(-2/9)*z-8/45 = 0
-2/9*z-8/45 = 0 // + 8/45
-2/9*z = 8/45 // : -2/9
z = 8/45/(-2/9)
z = -4/5
z = -4/5
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