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j in (-oo:+oo)
87/435 = j/5 // - j/5
87/435-(j/5) = 0
1/5-1/5*j = 0 // - 1/5
-1/5*j = -1/5 // : -1/5
j = -1/5/(-1/5)
j = 1
j = 1
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