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D( x )
(8*x-9)/(3*x-9) = 0
9*x-27 = 0
3*x-9 = 0
(8*x-9)/(3*x-9) = 0
(8*x-9)/(3*x-9) = 0
8*x-9 = 0 // + 9
8*x = 9 // : 8
x = 9/8
9*x-27 = 0
9*x-27 = 0
9*x-27 = 0 // + 27
9*x = 27 // : 9
x = 27/9
x = 3
3*x-9 = 0
3*x-9 = 0
3*x-9 = 0 // + 9
3*x = 9 // : 3
x = 9/3
x = 3
x in (-oo:9/8) U (9/8:3) U (3:+oo)
((40*x-45)/(9*x-27))/((8*x-9)/(3*x-9)) = 0
((40*x-45)*(3*x-9))/((9*x-27)*(8*x-9)) = 0
( 3*x-9 )
3*x-9 = 0 // + 9
3*x = 9 // : 3
x = 9/3
x = 3
( 40*x-45 )
40*x-45 = 0 // + 45
40*x = 45 // : 40
x = 45/40
x = 9/8
x in { 3}
x in { 9/8}
x belongs to the empty set
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