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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x+2 = 89 // - 89
3/x-89+2 = 0
3*x^-1 = 87 // : 3
x^-1 = 29
-1 < 0
1/(x^1) = 29 // * x^1
1 = 29*x^1 // : 29
1/29 = x^1
x = 1/29
x = 1/29
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