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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
180 = 7/X // - 7/X
180-(7/X) = 0
180-7*X^-1 = 0
-7*X^-1 = -180 // : -7
X^-1 = 180/7
-1 < 0
1/(X^1) = 180/7 // * X^1
1 = 180/7*X^1 // : 180/7
7/180 = X^1
X = 7/180
X = 7/180
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