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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(9/x-1)*(7/x-3) = 0
(9*x^-1-1)*(7*x^-1-3) = 0
( 7*x^-1-3 )
7*x^-1 = 3 // : 7
x^-1 = 3/7
-1 < 0
1/(x^1) = 3/7 // * x^1
1 = 3/7*x^1 // : 3/7
7/3 = x^1
x = 7/3
( 9*x^-1-1 )
9*x^-1 = 1 // : 9
x^-1 = 1/9
-1 < 0
1/(x^1) = 1/9 // * x^1
1 = 1/9*x^1 // : 1/9
9 = x^1
x = 9
x in { 7/3, 9 }
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