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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)
(7-x)/(x+6)+2 = 0
(7-x)/(x+6)+(2*(x+6))/(x+6) = 0
2*(x+6)-x+7 = 0
x+19 = 0
(x+19)/(x+6) = 0
(x+19)/(x+6) = 0 // * x+6
x+19 = 0
x+19 = 0 // - 19
x = -19
x = -19
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