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D( x )
x = 0
x+1 = 0
x = 0
x = 0
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-1) U (-1:0) U (0:+oo)
(x-3)/(x+1) = 2-(3/x) // - 2-(3/x)
(x-3)/(x+1)+3/x-2 = 0
(x*(x-3))/(x*(x+1))+(3*(x+1))/(x*(x+1))+(-2*x*(x+1))/(x*(x+1)) = 0
x*(x-3)+3*(x+1)-2*x*(x+1) = 0
x^2-2*x^2-2*x+3 = 0
3-x^2-2*x = 0
3-x^2-2*x = 0
3-x^2-2*x = 0
DELTA = (-2)^2-(-1*3*4)
DELTA = 16
DELTA > 0
x = (16^(1/2)+2)/(-1*2) or x = (2-16^(1/2))/(-1*2)
x = -3 or x = 1
(x+3)*(x-1) = 0
((x+3)*(x-1))/(x*(x+1)) = 0
((x+3)*(x-1))/(x*(x+1)) = 0 // * x*(x+1)
(x+3)*(x-1) = 0
( x+3 )
x+3 = 0 // - 3
x = -3
( x-1 )
x-1 = 0 // + 1
x = 1
x in { -3, 1 }
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