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