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j in (-oo:+oo)
-4*j-(5/(-7)) = 13 // - 13
-4*j-(5/(-7))-13 = 0
5/7-4*j-13 = 0
-4*j-86/7 = 0 // + 86/7
-4*j = 86/7 // : -4
j = 86/7/(-4)
j = -43/14
j = -43/14
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