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D( x )
x-24 = 0
x-24 = 0
x-24 = 0
x-24 = 0 // + 24
x = 24
x in (-oo:24) U (24:+oo)
(24*a)/(x-24) = (12*a)/30 // - (12*a)/30
(24*a)/(x-24)-((12*a)/30) = 0
(24*a)/(x-24)+(-2/5)*a = 0
(24*a)/(x-24)+(-2*a)/5 = 0
(5*24*a)/(5*(x-24))+(-2*a*(x-24))/(5*(x-24)) = 0
5*24*a-2*a*(x-24) = 0
168*a-2*a*x = 0
(168*a-2*a*x)/(5*(x-24)) = 0
(168*a-2*a*x)/(5*(x-24)) = 0 // * 5*(x-24)
168*a-2*a*x = 0
168*a-2*a*x = 0 // - 168*a
-2*a*x = -(168*a) // : -2*a
x = (-(168*a))/(-2*a)
x = 84
x = 84
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