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D( x )
2*x = 0
5*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/(2*x)-(6/(5*x))-(3/2) = 0
3/(2*x)+(-6/5)*x^-1-3/2 = 0
3/10*x^-1 = 3/2 // : 3/10
x^-1 = 5
-1 < 0
1/(x^1) = 5 // * x^1
1 = 5*x^1 // : 5
1/5 = x^1
x = 1/5
x = 1/5
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