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D( x )
x+4 = 0
x-2 = 0
x+4 = 0
x+4 = 0
x+4 = 0 // - 4
x = -4
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:-4) U (-4:2) U (2:+oo)
1/(x+4)-2/(x-2) = 1 // - 1
1/(x+4)-2/(x-2)-1 = 0
(-2*(x+4))/((x-2)*(x+4))+(1*(x-2))/((x-2)*(x+4))+(-1*(x-2)*(x+4))/((x-2)*(x+4)) = 0
1*(x-2)-2*(x+4)-1*(x-2)*(x+4) = 0
8-x^2-x-2*x-10 = 0
-x^2-3*x-2 = 0
-x^2-3*x-2 = 0
-1*(x^2+3*x+2) = 0
x^2+3*x+2 = 0
DELTA = 3^2-(1*2*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
-1*(x+2)*(x+1) = 0
(-1*(x+2)*(x+1))/((x-2)*(x+4)) = 0
(-1*(x+2)*(x+1))/((x-2)*(x+4)) = 0 // * (x-2)*(x+4)
-1*(x+2)*(x+1) = 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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