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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+10)/4-((5*x)/(x-4)) = x // - x
(4*x+10)/4-((5*x)/(x-4))-x = 0
(4*x+10)/4-5*x*(x-4)^-1-x = 0
(4*x+10)/4+(-5*x)/(x-4)-x = 0
((4*x+10)*(x-4))/(4*(x-4))+(-5*4*x)/(4*(x-4))+(4*(-x)*(x-4))/(4*(x-4)) = 0
(4*x+10)*(x-4)+4*(-x)*(x-4)-5*4*x = 0
4*x^2-4*x^2-26*x+16*x-40 = 0
-10*x-40 = 0
(-10*x-40)/(4*(x-4)) = 0
(-10*x-40)/(4*(x-4)) = 0 // * 4*(x-4)
-10*x-40 = 0
-10*x-40 = 0 // + 40
-10*x = 40 // : -10
x = 40/(-10)
x = -4
x = -4
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