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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x+1 = 4/7 // - 4/7
2/x-(4/7)+1 = 0
2/x-4/7+1 = 0
2*x^-1 = -3/7 // : 2
x^-1 = -3/14
-1 < 0
1/(x^1) = -3/14 // * x^1
1 = -3/14*x^1 // : -3/14
-14/3 = x^1
x = -14/3
x = -14/3
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