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D( x )
9*x-12 = 0
9*x-12 = 0
9*x-12 = 0
9*x-12 = 0 // + 12
9*x = 12 // : 9
x = 12/9
x = 4/3
x in (-oo:4/3) U (4/3:+oo)
(x*((3*x-4)/5))/(9*x-12) = 0
(x*(3*x-4))/(5*(9*x-12)) = 0
( 3*x-4 )
3*x-4 = 0 // + 4
3*x = 4 // : 3
x = 4/3
( x )
x = 0
x in { 4/3}
x = 0
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