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j in (-oo:+oo)
(2/7)*j-(1/2) = 6 // - 6
(2/7)*j-(1/2)-6 = 0
(2/7)*j-1/2-6 = 0
2/7*j-13/2 = 0 // + 13/2
2/7*j = 13/2 // : 2/7
j = 13/2/2/7
j = 91/4
j = 91/4
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