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z in (-oo:+oo)
-9*z = 4/8 // - 4/8
-9*z-(4/8) = 0
-9*z-1/2 = 0
-9*z-1/2 = 0 // + 1/2
-9*z = 1/2 // : -9
z = 1/2/(-9)
z = -1/18
z = -1/18
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