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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)
7/(X+2)-6 = (5*X+14)/(X+2) // - (5*X+14)/(X+2)
7/(X+2)-((5*X+14)/(X+2))-6 = 0
7/(X+2)+(-1*(5*X+14))/(X+2)-6 = 0
7/(X+2)+(-1*(5*X+14))/(X+2)+(-6*(X+2))/(X+2) = 0
7-1*(5*X+14)-6*(X+2) = 0
-5*X-6*X-12-7 = 0
-11*X-19 = 0
(-11*X-19)/(X+2) = 0
(-11*X-19)/(X+2) = 0 // * X+2
-11*X-19 = 0
-11*X-19 = 0 // + 19
-11*X = 19 // : -11
X = 19/(-11)
X = -19/11
X = -19/11
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