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n in (-oo:+oo)
3-3*n = 2*n-57 // - 2*n-57
3-3*n-(2*n)+57 = 0
3-3*n-2*n+57 = 0
60-5*n = 0 // - 60
-5*n = -60 // : -5
n = -60/(-5)
n = 12
n = 12
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