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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)
1/(x+1)-2 = -5 // + 5
1/(x+1)-2+5 = 0
1/(x+1)+(-2*(x+1))/(x+1)+(5*(x+1))/(x+1) = 0
5*(x+1)-2*(x+1)+1 = 0
5*x-2*x-1+5 = 0
3*x+4 = 0
(3*x+4)/(x+1) = 0
(3*x+4)/(x+1) = 0 // * x+1
3*x+4 = 0
3*x+4 = 0 // - 4
3*x = -4 // : 3
x = -4/3
x = -4/3
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