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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)
x/(x-4) = 6/5 // - 6/5
x/(x-4)-(6/5) = 0
x/(x-4)-6/5 = 0
(5*x)/(5*(x-4))+(-6*(x-4))/(5*(x-4)) = 0
5*x-6*(x-4) = 0
24-x = 0
(24-x)/(5*(x-4)) = 0
(24-x)/(5*(x-4)) = 0 // * 5*(x-4)
24-x = 0
24-x = 0 // - 24
-x = -24 // * -1
x = 24
x = 24
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