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