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D( x )
9*x-2 = 0
2-(9*x) = 0
9*x-2 = 0
9*x-2 = 0
9*x-2 = 0 // + 2
9*x = 2 // : 9
x = 2/9
2-(9*x) = 0
2-(9*x) = 0
2-9*x = 0
2-9*x = 0 // - 2
-9*x = -2 // : -9
x = -2/(-9)
x = 2/9
x in (-oo:2/9) U (2/9:+oo)
x/(2-(9*x))+(4*x)/(9*x-2) = 0
x/(2-9*x)+(4*x)/(9*x-2) = 0
(x*(9*x-2))/((2-9*x)*(9*x-2))+(4*x*(2-9*x))/((2-9*x)*(9*x-2)) = 0
x*(9*x-2)+4*x*(2-9*x) = 0
6*x-27*x^2 = 0
6*x-27*x^2 = 0
3*x*(2-9*x) = 0
2-9*x = 0 // - 2
-9*x = -2 // : -9
x = -2/(-9)
x = 2/9
3*x*(x-2/9) = 0
(3*x*(x-2/9))/((2-9*x)*(9*x-2)) = 0
(3*x*(x-2/9))/((2-9*x)*(9*x-2)) = 0 // * (2-9*x)*(9*x-2)
3*x*(x-2/9) = 0
( 3*x )
3*x = 0 // : 3
x = 0
( x-2/9 )
x-2/9 = 0 // + 2/9
x = 2/9
x in { 2/9}
x = 0
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