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n in (-oo:+oo)
1/20 = n/300 // - n/300
1/20-(n/300) = 0
1/20-1/300*n = 0 // - 1/20
-1/300*n = -1/20 // : -1/300
n = -1/20/(-1/300)
n = 15
n = 15
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