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D( j )
4*j+3 = 0
4*j+3 = 0
4*j+3 = 0
4*j+3 = 0 // - 3
4*j = -3 // : 4
j = -3/4
j in (-oo:-3/4) U (-3/4:+oo)
(12*j)/(4*j+3) = 0
12*j = 0 // : 12
j = 0
j = 0
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