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z in (-oo:+oo)
-9*z = -81/11 // + -81/11
-9*z-(-81/11) = 0
81/11-9*z = 0
81/11-9*z = 0 // - 81/11
-9*z = -81/11 // : -9
z = -81/11/(-9)
z = 9/11
z = 9/11
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