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j in (-oo:+oo)
2/43 = j/13 // - j/13
2/43-(j/13) = 0
2/43-1/13*j = 0 // - 2/43
-1/13*j = -2/43 // : -1/13
j = -2/43/(-1/13)
j = 26/43
j = 26/43
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