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n in (-oo:+oo)
7/5 = n/35 // - n/35
7/5-(n/35) = 0
7/5-1/35*n = 0 // - 7/5
-1/35*n = -7/5 // : -1/35
n = -7/5/(-1/35)
n = 49
n = 49
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