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D( x )
x+2 = 0
x+3 = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
x in (-oo:-3) U (-3:-2) U (-2:+oo)
5/(x+2) = -3/(x+3) // + -3/(x+3)
5/(x+2)-(-3/(x+3)) = 0
5/(x+2)+3*(x+3)^-1 = 0
5/(x+2)+3/(x+3) = 0
(5*(x+3))/((x+2)*(x+3))+(3*(x+2))/((x+2)*(x+3)) = 0
5*(x+3)+3*(x+2) = 0
8*x+21 = 0
(8*x+21)/((x+2)*(x+3)) = 0
(8*x+21)/((x+2)*(x+3)) = 0 // * (x+2)*(x+3)
8*x+21 = 0
8*x+21 = 0 // - 21
8*x = -21 // : 8
x = -21/8
x = -21/8
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