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D( x )
8-(9*x) = 0
8-(9*x) = 0
8-(9*x) = 0
8-9*x = 0
8-9*x = 0 // - 8
-9*x = -8 // : -9
x = -8/(-9)
x = 8/9
x in (-oo:8/9) U (8/9:+oo)
(3*x+1)/(8-(9*x)) = 0
(3*x+1)/(8-9*x) = 0
3*x+1 = 0 // - 1
3*x = -1 // : 3
x = -1/3
x = -1/3
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