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