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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x = 6/49 // - 6/49
2/x-(6/49) = 0
2/x-6/49 = 0
2*x^-1 = 6/49 // : 2
x^-1 = 3/49
-1 < 0
1/(x^1) = 3/49 // * x^1
1 = 3/49*x^1 // : 3/49
49/3 = x^1
x = 49/3
x = 49/3
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