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z in (-oo:+oo)
-9 = (1/6)*z-11 // - (1/6)*z-11
11-((1/6)*z)-9 = 0
(-1/6)*z-9+11 = 0
2-1/6*z = 0 // - 2
-1/6*z = -2 // : -1/6
z = -2/(-1/6)
z = 12
z = 12
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