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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)
2/(x+2)+4 = 14/(x+2) // - 14/(x+2)
2/(x+2)-(14/(x+2))+4 = 0
2/(x+2)-14*(x+2)^-1+4 = 0
2/(x+2)-14/(x+2)+4 = 0
2/(x+2)-14/(x+2)+(4*(x+2))/(x+2) = 0
4*(x+2)-14+2 = 0
4*x-12+8 = 0
4*x-4 = 0
(4*x-4)/(x+2) = 0
(4*x-4)/(x+2) = 0 // * x+2
4*x-4 = 0
4*x-4 = 0 // + 4
4*x = 4 // : 4
x = 4/4
x = 1
x = 1
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