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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-14/x-1 = -12/x // + -12/x
-14/x-(-12/x)-1 = 0
12*x^-1-14/x-1 = 0
-2*x^-1 = 1 // : -2
x^-1 = -1/2
-1 < 0
1/(x^1) = -1/2 // * x^1
1 = -1/2*x^1 // : -1/2
-2 = x^1
x = -2
x = -2
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