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n in (-oo:+oo)
6/20 = n/70 // - n/70
6/20-(n/70) = 0
3/10-1/70*n = 0 // - 3/10
-1/70*n = -3/10 // : -1/70
n = -3/10/(-1/70)
n = 21
n = 21
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