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D( x )
x-5 = 0
x+1 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-1) U (-1:5) U (5:+oo)
3/(x-5) = (3/(x-5))*(x+1)-2/(x+1) // - (3/(x-5))*(x+1)-2/(x+1)
3/(x-5)-(-2/(x+1))-((3/(x-5))*(x+1)) = 0
3/(x-5)+2*(x+1)^-1-3*(x+1)*(x-5)^-1 = 0
3/(x-5)+2/(x+1)+(-3*(x+1))/(x-5) = 0
(3*(x+1))/((x-5)*(x+1))+(2*(x-5))/((x-5)*(x+1))+(-3*(x+1)^2)/((x-5)*(x+1)) = 0
3*(x+1)+2*(x-5)-3*(x+1)^2 = 0
5*x-3*x^2-6*x-7-3 = 0
-3*x^2-x-10 = 0
-3*x^2-x-10 = 0
-1*(3*x^2+x+10) = 0
3*x^2+x+10 = 0
DELTA = 1^2-(3*4*10)
DELTA = -119
DELTA < 0
-1 = 0
-1/((x-5)*(x+1)) = 0
-1/((x-5)*(x+1)) = 0 // * (x-5)*(x+1)
-1 = 0
x belongs to the empty set
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