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j in (-oo:+oo)
(5*j-6)/2 = -13 // + 13
(5*j-6)/2+13 = 0
(5*j-6)/2+(2*13)/2 = 0
5*j+2*13-6 = 0
5*j+20 = 0
(5*j+20)/2 = 0
(5*j+20)/2 = 0 // * 2
5*j+20 = 0
5*j+20 = 0 // - 20
5*j = -20 // : 5
j = -20/5
j = -4
j = -4
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