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n in (-oo:+oo)
3*n+1 = 85-4*n // - 85-4*n
3*n-(-4*n)-85+1 = 0
3*n+4*n-85+1 = 0
7*n-84 = 0 // + 84
7*n = 84 // : 7
n = 84/7
n = 12
n = 12
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