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n in (-oo:+oo)
17/51 = n/3 // - n/3
17/51-(n/3) = 0
1/3-1/3*n = 0 // - 1/3
-1/3*n = -1/3 // : -1/3
n = -1/3/(-1/3)
n = 1
n = 1
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