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n in (-oo:+oo)
18/30 = n/10 // - n/10
18/30-(n/10) = 0
3/5-1/10*n = 0 // - 3/5
-1/10*n = -3/5 // : -1/10
n = -3/5/(-1/10)
n = 6
n = 6
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