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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
18.75/X = 2.8 // - 2.8
18.75/X-2.8 = 0
18.75*X^-1 = 2.8 // : 18.75
X^-1 = 0.14933333
-1 < 0
1/(X^1) = 0.14933333 // * X^1
1 = 0.14933333*X^1 // : 0.14933333
6.69642872 = X^1
X = 6.69642872
X = 6.69642872
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