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j in (-oo:+oo)
5/(-7)-4*j = 13 // - 13
5/(-7)-4*j-13 = 0
-4*j-96/7 = 0 // + 96/7
-4*j = 96/7 // : -4
j = 96/7/(-4)
j = -24/7
j = -24/7
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