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