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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
26/288 = 13/X // - 13/X
26/288-(13/X) = 0
26/288-13*X^-1 = 0
-13*X^-1 = -13/144 // : -13
X^-1 = 1/144
-1 < 0
1/(X^1) = 1/144 // * X^1
1 = 1/144*X^1 // : 1/144
144 = X^1
X = 144
X = 144
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