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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X/112 = 7/x // - 7/x
X/112-(7/x) = 0
X/112-7*x^-1 = 0
-7*x^-1 = -(1/112*X) // : -7
x^-1 = 1/784*X
-1 < 0
1/(x^1) = 1/784*X // * x^1
1 = 1/784*X*x^1 // : 1/784*X
784*X^-1 = x^1
x = 784*X^-1
x = 784*X^-1
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