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j in (-oo:+oo)
4/6 = (4*j)/6 // - (4*j)/6
4/6-((4*j)/6) = 0
(-2/3)*j+4/6 = 0
2/3-2/3*j = 0 // - 2/3
-2/3*j = -2/3 // : -2/3
j = -2/3/(-2/3)
j = 1
j = 1
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