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D( x )
x-2 = 0
x+6 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x+6 = 0
x+6 = 0
x+6 = 0 // - 6
x = -6
x in (-oo:-6) U (-6:2) U (2:+oo)
9/(x-2)-(6/(x+6)) = 0
9/(x-2)-6*(x+6)^-1 = 0
9/(x-2)-6/(x+6) = 0
(9*(x+6))/((x-2)*(x+6))+(-6*(x-2))/((x-2)*(x+6)) = 0
9*(x+6)-6*(x-2) = 0
3*x+66 = 0
(3*x+66)/((x-2)*(x+6)) = 0
(3*x+66)/((x-2)*(x+6)) = 0 // * (x-2)*(x+6)
3*x+66 = 0
3*x+66 = 0 // - 66
3*x = -66 // : 3
x = -66/3
x = -22
x = -22
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