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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/4+3 = 9/x-4 // - 9/x-4
9/4-(9/x)+3+4 = 0
9/4-9*x^-1+3+4 = 0
-9*x^-1 = -37/4 // : -9
x^-1 = 37/36
-1 < 0
1/(x^1) = 37/36 // * x^1
1 = 37/36*x^1 // : 37/36
36/37 = x^1
x = 36/37
x = 36/37
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