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D( x )
x+9 = 0
x+9 = 0
x+9 = 0
x+9 = 0 // - 9
x = -9
x in (-oo:-9) U (-9:+oo)
(2*x-3)/(x+9) = 1 // - 1
(2*x-3)/(x+9)-1 = 0
(2*x-3)/(x+9)+(-1*(x+9))/(x+9) = 0
2*x-1*(x+9)-3 = 0
x-12 = 0
(x-12)/(x+9) = 0
(x-12)/(x+9) = 0 // * x+9
x-12 = 0
x-12 = 0 // + 12
x = 12
x = 12
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