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j in (-oo:+oo)
(2/7)*j-(1/7) = 13/14 // - 13/14
(2/7)*j-(1/7)-(13/14) = 0
(2/7)*j-1/7-13/14 = 0
2/7*j-15/14 = 0 // + 15/14
2/7*j = 15/14 // : 2/7
j = 15/14/2/7
j = 15/4
j = 15/4
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