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D( x )
x-5 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x in (-oo:5) U (5:+oo)
9/4 = 6/(x-5) // - 6/(x-5)
9/4-(6/(x-5)) = 0
9/4-6*(x-5)^-1 = 0
9/4-6/(x-5) = 0
(-6*4)/(4*(x-5))+(9*(x-5))/(4*(x-5)) = 0
9*(x-5)-6*4 = 0
9*x-69 = 0
(9*x-69)/(4*(x-5)) = 0
(9*x-69)/(4*(x-5)) = 0 // * 4*(x-5)
9*x-69 = 0
9*x-69 = 0 // + 69
9*x = 69 // : 9
x = 69/9
x = 23/3
x = 23/3
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