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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
96-4*j = 0
(96-4*j)/(-7) = 0
(96-4*j)/(-7) = 0 // * -7
96-4*j = 0
96-4*j = 0 // - 96
-4*j = -96 // : -4
j = -96/(-4)
j = 24
j = 24
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