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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X/4 = 49/x // - 49/x
X/4-(49/x) = 0
X/4-49*x^-1 = 0
-49*x^-1 = -(1/4*X) // : -49
x^-1 = 1/196*X
-1 < 0
1/(x^1) = 1/196*X // * x^1
1 = 1/196*X*x^1 // : 1/196*X
196*X^-1 = x^1
x = 196*X^-1
x = 196*X^-1
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