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z in (-oo:+oo)
11-((z^1)/6) = -9 // + 9
9-((z^1)/6)+11 = 0
9-(z/6)+11 = 0
20-1/6*z = 0 // - 20
-1/6*z = -20 // : -1/6
z = -20/(-1/6)
z = 120
z = 120
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