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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
28/x+1 = 7/6 // - 7/6
28/x-(7/6)+1 = 0
28/x-7/6+1 = 0
28*x^-1 = 1/6 // : 28
x^-1 = 1/168
-1 < 0
1/(x^1) = 1/168 // * x^1
1 = 1/168*x^1 // : 1/168
168 = x^1
x = 168
x = 168
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