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j in (-oo:+oo)
21/57 = j/95 // - j/95
21/57-(j/95) = 0
7/19-1/95*j = 0 // - 7/19
-1/95*j = -7/19 // : -1/95
j = -7/19/(-1/95)
j = 35
j = 35
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