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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)
(3*x-((4/5)*x))/(9*x-12) = 0
(3*x+(-4/5)*x)/(9*x-12) = 0
(11/5*x)/(9*x-12) = 0
11/5*x = 0 // : 11/5
x = 0
x = 0
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