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j in (-oo:+oo)
2/3 = (4*j)/5 // - (4*j)/5
2/3-((4*j)/5) = 0
(-4/5)*j+2/3 = 0
2/3-4/5*j = 0 // - 2/3
-4/5*j = -2/3 // : -4/5
j = -2/3/(-4/5)
j = 5/6
j = 5/6
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