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n in (-oo:+oo)
42/30 = n/25 // - n/25
42/30-(n/25) = 0
7/5-1/25*n = 0 // - 7/5
-1/25*n = -7/5 // : -1/25
n = -7/5/(-1/25)
n = 35
n = 35
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