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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) = -6 // + 6
3/(-4*x-2)+6 = 0
3/(-4*x-2)+(6*(-4*x-2))/(-4*x-2) = 0
6*(-4*x-2)+3 = 0
-24*x-9 = 0
(-24*x-9)/(-4*x-2) = 0
(-24*x-9)/(-4*x-2) = 0 // * -4*x-2
-24*x-9 = 0
-24*x-9 = 0 // + 9
-24*x = 9 // : -24
x = 9/(-24)
x = -3/8
x = -3/8
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