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j in (-oo:+oo)
j/(3/9) = 6/7 // - 6/7
j/(3/9)-(6/7) = 0
j/(3/9)-6/7 = 0
3*j-6/7 = 0 // + 6/7
3*j = 6/7 // : 3
j = 6/7/3
j = 2/7
j = 2/7
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