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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/14 = 7/x-3 // - 7/x-3
6/14-(7/x)+3 = 0
6/14-7*x^-1+3 = 0
-7*x^-1 = -24/7 // : -7
x^-1 = 24/49
-1 < 0
1/(x^1) = 24/49 // * x^1
1 = 24/49*x^1 // : 24/49
49/24 = x^1
x = 49/24
x = 49/24
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