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D( x )
3*x = 0
9*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
9*x = 0
9*x = 0
9*x = 0 // : 9
x = 0
x in (-oo:0) U (0:+oo)
2/(3*x)+4/(9*x) = 1 // - 1
2/(3*x)+4/(9*x)-1 = 0
10/9*x^-1 = 1 // : 10/9
x^-1 = 9/10
-1 < 0
1/(x^1) = 9/10 // * x^1
1 = 9/10*x^1 // : 9/10
10/9 = x^1
x = 10/9
x = 10/9
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