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D( x )
5*x-9 = 0
5*x-9 = 0
5*x-9 = 0
5*x-9 = 0 // + 9
5*x = 9 // : 5
x = 9/5
x in (-oo:9/5) U (9/5:+oo)
(((2*x+3)*(5*x-9))/(5*x-9))*(4*x-7) = 0
(2*x+3)*(4*x-7) = 0
( 2*x+3 )
2*x+3 = 0 // - 3
2*x = -3 // : 2
x = -3/2
( 4*x-7 )
4*x-7 = 0 // + 7
4*x = 7 // : 4
x = 7/4
x in { -3/2, 7/4 }
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