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