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D( x )
x+3 = 0
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
x in (-oo:-3) U (-3:+oo)
2/(x+3)+14 = 10 // - 10
2/(x+3)-10+14 = 0
2/(x+3)+(-10*(x+3))/(x+3)+(14*(x+3))/(x+3) = 0
14*(x+3)-10*(x+3)+2 = 0
14*x-10*x-28+42 = 0
4*x+14 = 0
(4*x+14)/(x+3) = 0
(4*x+14)/(x+3) = 0 // * x+3
4*x+14 = 0
4*x+14 = 0 // - 14
4*x = -14 // : 4
x = -14/4
x = -7/2
x = -7/2
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