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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
168/X = 120 // - 120
168/X-120 = 0
168*X^-1 = 120 // : 168
X^-1 = 5/7
-1 < 0
1/(X^1) = 5/7 // * X^1
1 = 5/7*X^1 // : 5/7
7/5 = X^1
X = 7/5
X = 7/5
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