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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x+3 = -31/4 // + -31/4
2/x-(-31/4)+3 = 0
2/x+31/4+3 = 0
2*x^-1 = -43/4 // : 2
x^-1 = -43/8
-1 < 0
1/(x^1) = -43/8 // * x^1
1 = -43/8*x^1 // : -43/8
-8/43 = x^1
x = -8/43
x = -8/43
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