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D( x )
x-4 = 0
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:4) U (4:+oo)
(4*x+4)/4-((4*x)/(x-4)) = x // - x
(4*x+4)/4-((4*x)/(x-4))-x = 0
(4*x+4)/4-4*x*(x-4)^-1-x = 0
(4*x+4)/4+(-4*x)/(x-4)-x = 0
((4*x+4)*(x-4))/(4*(x-4))+(-4*4*x)/(4*(x-4))+(4*(-x)*(x-4))/(4*(x-4)) = 0
(4*x+4)*(x-4)+4*(-x)*(x-4)-4*4*x = 0
4*x^2-4*x^2-28*x+16*x-16 = 0
-12*x-16 = 0
(-12*x-16)/(4*(x-4)) = 0
(-12*x-16)/(4*(x-4)) = 0 // * 4*(x-4)
-12*x-16 = 0
-12*x-16 = 0 // + 16
-12*x = 16 // : -12
x = 16/(-12)
x = -4/3
x = -4/3
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