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D( x )
x = 0
2*x = 0
x = 0
x = 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
x in (-oo:0) U (0:+oo)
2/x+3 = 5/(2*x)+13/4 // - 5/(2*x)+13/4
2/x-(5/(2*x))-(13/4)+3 = 0
2/x+(-5/2)*x^-1-13/4+3 = 0
-1/2*x^-1 = 1/4 // : -1/2
x^-1 = -1/2
-1 < 0
1/(x^1) = -1/2 // * x^1
1 = -1/2*x^1 // : -1/2
-2 = x^1
x = -2
x = -2
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