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D( x )
9*x-3 = 0
9*x-3 = 0
9*x-3 = 0
9*x-3 = 0 // + 3
9*x = 3 // : 9
x = 3/9
x = 1/3
x in (-oo:1/3) U (1/3:+oo)
1/(9*x-3) = -10 // + 10
1/(9*x-3)+10 = 0
1/(9*x-3)+(10*(9*x-3))/(9*x-3) = 0
10*(9*x-3)+1 = 0
90*x-29 = 0
(90*x-29)/(9*x-3) = 0
(90*x-29)/(9*x-3) = 0 // * 9*x-3
90*x-29 = 0
90*x-29 = 0 // + 29
90*x = 29 // : 90
x = 29/90
x = 29/90
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