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j in (-oo:+oo)
5-4*j = 13/(-7) // - 13/(-7)
5-4*j-(13/(-7)) = 0
13/7-4*j+5 = 0
48/7-4*j = 0 // - 48/7
-4*j = -48/7 // : -4
j = -48/7/(-4)
j = 12/7
j = 12/7
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