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D( x )
x+5 = 0
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
x in (-oo:-5) U (-5:+oo)
((2*x)/(x+5))*(x+4)+1 = 2/(x+5)+4*(x+4) // - 2/(x+5)+4*(x+4)
((2*x)/(x+5))*(x+4)-(2/(x+5))-(4*(x+4))+1 = 0
((2*x)/(x+5))*(x+4)-2*(x+5)^-1-4*(x+4)+1 = 0
(2*x*(x+4))/(x+5)-2/(x+5)-4*(x+4)+1 = 0
(2*x*(x+4))/(x+5)-2/(x+5)+(-4*(x+4)*(x+5))/(x+5)+(1*(x+5))/(x+5) = 0
2*x*(x+4)-4*(x+4)*(x+5)+1*(x+5)-2 = 0
2*x^2-4*x^2+8*x-36*x+x-80-2+5 = 0
x-2*x^2-28*x-82+5 = 0
-2*x^2-27*x-77 = 0
-2*x^2-27*x-77 = 0
-1*(2*x^2+27*x+77) = 0
2*x^2+27*x+77 = 0
DELTA = 27^2-(2*4*77)
DELTA = 113
DELTA > 0
x = (113^(1/2)-27)/(2*2) or x = (-113^(1/2)-27)/(2*2)
x = (113^(1/2)-27)/4 or x = (-(113^(1/2)+27))/4
-1*(x+(113^(1/2)+27)/4)*(x-((113^(1/2)-27)/4)) = 0
(-1*(x+(113^(1/2)+27)/4)*(x-((113^(1/2)-27)/4)))/(x+5) = 0
(-1*(x+(113^(1/2)+27)/4)*(x-((113^(1/2)-27)/4)))/(x+5) = 0 // * x+5
-1*(x+(113^(1/2)+27)/4)*(x-((113^(1/2)-27)/4)) = 0
( x+(113^(1/2)+27)/4 )
x+(113^(1/2)+27)/4 = 0 // - (113^(1/2)+27)/4
x = -((113^(1/2)+27)/4)
( x-((113^(1/2)-27)/4) )
x-((113^(1/2)-27)/4) = 0 // + (113^(1/2)-27)/4
x = (113^(1/2)-27)/4
x in { -((113^(1/2)+27)/4), (113^(1/2)-27)/4 }
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