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D( z )
z-10 = 0
z-10 = 0
z-10 = 0
z-10 = 0 // + 10
z = 10
z in (-oo:10) U (10:+oo)
(z+5)/(z-10) = 11/8 // - 11/8
(z+5)/(z-10)-(11/8) = 0
(z+5)/(z-10)-11/8 = 0
(8*(z+5))/(8*(z-10))+(-11*(z-10))/(8*(z-10)) = 0
8*(z+5)-11*(z-10) = 0
150-3*z = 0
(150-3*z)/(8*(z-10)) = 0
(150-3*z)/(8*(z-10)) = 0 // * 8*(z-10)
150-3*z = 0
150-3*z = 0 // - 150
-3*z = -150 // : -3
z = -150/(-3)
z = 50
z = 50
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