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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
(X-7)/X = 56.7 // - 56.7
(X-7)/X-56.7 = 0
(X-7)/X+(-56.7*X)/X = 0
X-56.7*X-7 = 0
-55.7*X-7 = 0
(-55.7*X-7)/X = 0
(-55.7*X-7)/X = 0 // * X
-55.7*X-7 = 0
-55.7*X-7 = 0 // + 7
-55.7*X = 7 // : -55.7
X = 7/(-55.7)
X = -0.12567325
X = -0.12567325
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