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n in (-oo:+oo)
5/7 = n/105 // - n/105
5/7-(n/105) = 0
5/7-1/105*n = 0 // - 5/7
-1/105*n = -5/7 // : -1/105
n = -5/7/(-1/105)
n = 75
n = 75
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