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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.8 = 14/x // - 14/x
2.8-(14/x) = 0
2.8-14*x^-1 = 0
-14*x^-1 = -2.8 // : -14
x^-1 = 0.2
-1 < 0
1/(x^1) = 0.2 // * x^1
1 = 0.2*x^1 // : 0.2
5 = x^1
x = 5
x = 5
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