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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)
4/(3*x)-(5/4) = 4/(9*x) // - 4/(9*x)
4/(3*x)-(4/(9*x))-(5/4) = 0
4/(3*x)+(-4/9)*x^-1-5/4 = 0
8/9*x^-1 = 5/4 // : 8/9
x^-1 = 45/32
-1 < 0
1/(x^1) = 45/32 // * x^1
1 = 45/32*x^1 // : 45/32
32/45 = x^1
x = 32/45
x = 32/45
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