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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14/x+1/6 = 0
14*x^-1 = -1/6 // : 14
x^-1 = -1/84
-1 < 0
1/(x^1) = -1/84 // * x^1
1 = -1/84*x^1 // : -1/84
-84 = x^1
x = -84
x = -84
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