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D( x )
-4*x-2 = 0
-4*x-2 = 0
-4*x-2 = 0
-4*x-2 = 0 // + 2
-4*x = 2 // : -4
x = 2/(-4)
x = -1/2
x in (-oo:-1/2) U (-1/2:+oo)
3/(-4*x-2) = 0
3 = 0
x belongs to the empty set
x belongs to the empty set
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