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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x = 2/14 // - 2/14
7/x-(2/14) = 0
7/x-1/7 = 0
7*x^-1 = 1/7 // : 7
x^-1 = 1/49
-1 < 0
1/(x^1) = 1/49 // * x^1
1 = 1/49*x^1 // : 1/49
49 = x^1
x = 49
x = 49
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