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n in (-oo:+oo)
10/12 = n/30 // - n/30
10/12-(n/30) = 0
5/6-1/30*n = 0 // - 5/6
-1/30*n = -5/6 // : -1/30
n = -5/6/(-1/30)
n = 25
n = 25
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