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D( x )
4*x = 0
2*x = 0
5*x = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
5*x = 0
5*x = 0
5*x = 0 // : 5
x = 0
x in (-oo:0) U (0:+oo)
3/(5*x)-(3/(2*x))-(1/4) = 7/5-(9/(4*x)) // - 7/5-(9/(4*x))
3/(5*x)-(3/(2*x))+9/(4*x)-(1/4)-(7/5) = 0
3/(5*x)+(-3/2)*x^-1+9/(4*x)-1/4-7/5 = 0
27/20*x^-1 = 33/20 // : 27/20
x^-1 = 11/9
-1 < 0
1/(x^1) = 11/9 // * x^1
1 = 11/9*x^1 // : 11/9
9/11 = x^1
x = 9/11
x = 9/11
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