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D( j )
j = 0
j = 0
j = 0
j in (-oo:0) U (0:+oo)
300/24 = 18/j // - 18/j
300/24-(18/j) = 0
300/24-18*j^-1 = 0
-18*j^-1 = -25/2 // : -18
j^-1 = 25/36
-1 < 0
1/(j^1) = 25/36 // * j^1
1 = 25/36*j^1 // : 25/36
36/25 = j^1
j = 36/25
j = 36/25
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