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D( x )
x+2 = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x in (-oo:-2) U (-2:+oo)
(x+4)/(x+2)-((3*x-8)/(x+2)) = 0
(x+4)/(x+2)+(-1*(3*x-8))/(x+2) = 0
x-1*(3*x-8)+4 = 0
12-2*x = 0
(12-2*x)/(x+2) = 0
(12-2*x)/(x+2) = 0 // * x+2
12-2*x = 0
12-2*x = 0 // - 12
-2*x = -12 // : -2
x = -12/(-2)
x = 6
x = 6
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