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D( x )
x+5 = 0
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
x in (-oo:-5) U (-5:+oo)
4/3 = 6/(x+5) // - 6/(x+5)
4/3-(6/(x+5)) = 0
4/3-6*(x+5)^-1 = 0
4/3-6/(x+5) = 0
(-6*3)/(3*(x+5))+(4*(x+5))/(3*(x+5)) = 0
4*(x+5)-6*3 = 0
4*x+2 = 0
(4*x+2)/(3*(x+5)) = 0
(4*x+2)/(3*(x+5)) = 0 // * 3*(x+5)
4*x+2 = 0
4*x+2 = 0 // - 2
4*x = -2 // : 4
x = -2/4
x = -1/2
x = -1/2
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