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j in (-oo:+oo)
(4*j)/6 = 18/12 // - 18/12
(4*j)/6-(18/12) = 0
(4*j)/6-3/2 = 0
2/3*j-3/2 = 0 // + 3/2
2/3*j = 3/2 // : 2/3
j = 3/2/2/3
j = 9/4
j = 9/4
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