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D( x )
6-x = 0
6-x = 0
6-x = 0
6-x = 0 // - 6
-x = -6 // * -1
x = 6
x in (-oo:6) U (6:+oo)
(3*x+15)/(6-x) = 0
3*x+15 = 0 // - 15
3*x = -15 // : 3
x = -15/3
x = -5
x = -5
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