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D( x )
(x+9)/(x-9) <= 0
x-9 = 0
(x+9)/(x-9) <= 0
(x+9)/(x-9) <= 0
( x+9 )
x+9 <= 0 // - 9
x <= -9
( x-9 )
x-9 <= 0 // + 9
x <= 9
(-oo:-9)(-9:9)(9:+oo)x+9-++x-9--+
x-9 = 0
x-9 = 0
x-9 = 0 // + 9
x = 9
x in (-oo:-9) U (9:+oo)
((ln((x+9)/(x-9)))^1)/7 = 0
ln((x+9)/(x-9))/7 = 0
1/7*ln((x+9)/(x-9)) = 0 // : 1/7
ln((x+9)/(x-9)) = 0
ln((x+9)/(x-9)) = ln(e^0)
(x+9)/(x-9) = e^0
(x+9)/(x-9)-e^0 = 0
(x+9)/(x-9)-1 = 0
(x+9)/(x-9)+(-1*(x-9))/(x-9) = 0
x-1*(x-9)+9 = 0
18 = 0
18/(x-9) = 0
18/(x-9) = 0 // * x-9
18 = 0
x belongs to the empty set
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