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