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j in (-oo:+oo)
2/5 = (4*j)/10 // - (4*j)/10
2/5-((4*j)/10) = 0
(-2/5)*j+2/5 = 0
2/5-2/5*j = 0 // - 2/5
-2/5*j = -2/5 // : -2/5
j = -2/5/(-2/5)
j = 1
j = 1
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