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D( x )
x+1 = 0
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-1) U (-1:+oo)
6/(x+1)+5 = 8 // - 8
6/(x+1)-8+5 = 0
6/(x+1)+(-8*(x+1))/(x+1)+(5*(x+1))/(x+1) = 0
5*(x+1)-8*(x+1)+6 = 0
5*x-8*x-2+5 = 0
3-3*x = 0
(3-3*x)/(x+1) = 0
(3-3*x)/(x+1) = 0 // * x+1
3-3*x = 0
3-3*x = 0 // - 3
-3*x = -3 // : -3
x = -3/(-3)
x = 1
x = 1
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