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