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j in (-oo:+oo)
(5-4*j)/7 = 13 // - 13
(5-4*j)/7-13 = 0
(5-4*j)/7+(-13*7)/7 = 0
5-4*j-13*7 = 0
-4*j-86 = 0
(-4*j-86)/7 = 0
(-4*j-86)/7 = 0 // * 7
-4*j-86 = 0
-4*j-86 = 0 // + 86
-4*j = 86 // : -4
j = 86/(-4)
j = -43/2
j = -43/2
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