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D( x )
x-6 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x in (-oo:6) U (6:+oo)
(((x-7)*(x-3))/(x-6))*(x+6) = 0
((x-7)*(x-3)*(x+6))/(x-6) = 0
( x+6 )
x+6 = 0 // - 6
x = -6
( x-3 )
x-3 = 0 // + 3
x = 3
( x-7 )
x-7 = 0 // + 7
x = 7
x in { -6, 3, 7 }
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