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