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n in (-oo:+oo)
39 = 3*n+n+3 // - 3*n+n+3
39-(3*n)-n-3 = 0
39-3*n-n-3 = 0
36-4*n = 0 // - 36
-4*n = -36 // : -4
n = -36/(-4)
n = 9
n = 9
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