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D( j )
j = 0
j = 0
j = 0
j in (-oo:0) U (0:+oo)
7-j-4-1 = 6/j-4 // - 6/j-4
4-j-(6/j)-4-1+7 = 0
4-j-6*j^-1-4-1+7 = 0
6*j^0-1*j^1-6*j^-1 = 0
(6*j^1-1*j^2-6*j^0)/(j^1) = 0 // * j^2
j^1*(6*j^1-1*j^2-6*j^0) = 0
j^1
6*j-j^2-6 = 0
6*j-j^2-6 = 0
DELTA = 6^2-(-6*(-1)*4)
DELTA = 12
DELTA > 0
j = (12^(1/2)-6)/(-1*2) or j = (-12^(1/2)-6)/(-1*2)
j = (2*3^(1/2)-6)/(-2) or j = (-2*3^(1/2)-6)/(-2)
j in { (2*3^(1/2)-6)/(-2), (-2*3^(1/2)-6)/(-2)}
j in { (2*3^(1/2)-6)/(-2), (-2*3^(1/2)-6)/(-2) }
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