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j in (-oo:+oo)
4/5 = (8*j)/10 // - (8*j)/10
4/5-((8*j)/10) = 0
(-4/5)*j+4/5 = 0
4/5-4/5*j = 0 // - 4/5
-4/5*j = -4/5 // : -4/5
j = -4/5/(-4/5)
j = 1
j = 1
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