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j in (-oo:+oo)
2/7 = (4*j)/14 // - (4*j)/14
2/7-((4*j)/14) = 0
(-2/7)*j+2/7 = 0
2/7-2/7*j = 0 // - 2/7
-2/7*j = -2/7 // : -2/7
j = -2/7/(-2/7)
j = 1
j = 1
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