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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x)/x+1+24 = 2*x+3/3 // - 2*x+3/3
(2*x)/x-(2*x)-(3/3)+1+24 = 0
(2*x)/x-2*x-1+1+24 = 0
26-2*x = 0 // - 26
-2*x = -26 // : -2
x = -26/(-2)
x = 13
x = 13
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