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D( x )
9-x = 0
9-x = 0
9-x = 0
9-x = 0 // - 9
-x = -9 // * -1
x = 9
x in (-oo:9) U (9:+oo)
(8*x)/(9-x) >= 0
( 8*x )
8*x+0 >= 0 // - 0
8*x >= 0 // : 8
x >= 0/8
x >= 0
( 9-x )
9-x >= 0
-x >= -9 // * -1
x <= 9
(-oo:0) (0:9) (9:+oo) 8*x - + + 9-x + + -
x in <0:9)
<0:9)
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