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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*(1/x) = (5/2)*(1/x)+3 // - (5/2)*(1/x)+3
4*(1/x)-((5/2)*(1/x))-3 = 0
4*(1/x)+(-5/2)*x^-1-3 = 0
3/2*x^-1 = 3 // : 3/2
x^-1 = 2
-1 < 0
1/(x^1) = 2 // * x^1
1 = 2*x^1 // : 2
1/2 = x^1
x = 1/2
x = 1/2
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