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z in (-oo:+oo)
(-2/9)*z = 8/36 // - 8/36
(-2/9)*z-(8/36) = 0
(-2/9)*z-2/9 = 0
-2/9*z-2/9 = 0 // + 2/9
-2/9*z = 2/9 // : -2/9
z = 2/9/(-2/9)
z = -1
z = -1
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