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D( x )
-8*x = 0
-8*x = 0
-8*x = 0
-8*x = 0 // : -8
x = 0
x in (-oo:0) U (0:+oo)
(-48*x-6)/(-8*x) = 0
-48*x-6 = 0 // + 6
-48*x = 6 // : -48
x = 6/(-48)
x = -1/8
x = -1/8
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