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D( x )
x/4 = 0
x/4 = 0
x/4 = 0
1/4*x = 0 // : 1/4
x = 0
x in (-oo:0) U (0:+oo)
(10-2)/(x/4) = -6 // + 6
(10-2)/(x/4)+6 = 0
32*x^-1 = -6 // : 32
x^-1 = -3/16
-1 < 0
1/(x^1) = -3/16 // * x^1
1 = -3/16*x^1 // : -3/16
-16/3 = x^1
x = -16/3
x = -16/3
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