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D( X_3 )
X_3 = 0
X_3 = 0
X_3 = 0
X_3 in (-oo:0) U (0:+oo)
0 = 2400/X_3 // - 2400/X_3
0-(2400/X_3) = 0
-2400*X_3^-1 = 0
-2400*X_3^-1 = 0 // : -2400
X_3^-1 = 0
X_3 należy do O
X_3 belongs to the empty set
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