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n in (-oo:+oo)
51-(n/3)-n = 13 // - 13
51-(n/3)-n-13 = 0
38-4/3*n = 0 // - 38
-4/3*n = -38 // : -4/3
n = -38/(-4/3)
n = 57/2
n = 57/2
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