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j in (-oo:+oo)
4*j-(8/5) = j-4 // - j-4
4*j-j-(8/5)+4 = 0
4*j-j-8/5+4 = 0
3*j+12/5 = 0 // - 12/5
3*j = -12/5 // : 3
j = -12/5/3
j = -4/5
j = -4/5
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