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D( j )
3*j = 0
3*j = 0
3*j = 0
3*j = 0 // : 3
j = 0
j in (-oo:0) U (0:+oo)
(7*j^2-(4*j))/(3*j) = 0
(7*j^2-4*j)/(3*j) = 0
7*j^2-4*j = 0
j*(7*j-4) = 0
7*j-4 = 0 // + 4
7*j = 4 // : 7
j = 4/7
j*(j-4/7) = 0
(j*(j-4/7))/(3*j) = 0
( j-4/7 )
j-4/7 = 0 // + 4/7
j = 4/7
( j )
j = 0
j in { 0}
j = 4/7
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