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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)
1/(x-5) = 3 // - 3
1/(x-5)-3 = 0
1/(x-5)+(-3*(x-5))/(x-5) = 0
1-3*(x-5) = 0
16-3*x = 0
(16-3*x)/(x-5) = 0
(16-3*x)/(x-5) = 0 // * x-5
16-3*x = 0
16-3*x = 0 // - 16
-3*x = -16 // : -3
x = -16/(-3)
x = 16/3
x = 16/3
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