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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:-5) U (-5:1) U (1:+oo)
(4*x)/(x+5)-(8/(x-1)) = 4 // - 4
(4*x)/(x+5)-(8/(x-1))-4 = 0
(4*x)/(x+5)-8*(x-1)^-1-4 = 0
(4*x)/(x+5)-8/(x-1)-4 = 0
(4*x*(x-1))/((x+5)*(x-1))+(-8*(x+5))/((x+5)*(x-1))+(-4*(x+5)*(x-1))/((x+5)*(x-1)) = 0
4*x*(x-1)-8*(x+5)-4*(x+5)*(x-1) = 0
4*x^2-4*x^2-12*x-16*x-40+20 = 0
-28*x-20 = 0
(-28*x-20)/((x+5)*(x-1)) = 0
(-28*x-20)/((x+5)*(x-1)) = 0 // * (x+5)*(x-1)
-28*x-20 = 0
-28*x-20 = 0 // + 20
-28*x = 20 // : -28
x = 20/(-28)
x = -5/7
x = -5/7
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