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