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j in (-oo:+oo)
16 = (4/5)*j // - (4/5)*j
16-((4/5)*j) = 0
(-4/5)*j+16 = 0
16-4/5*j = 0 // - 16
-4/5*j = -16 // : -4/5
j = -16/(-4/5)
j = 20
j = 20
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