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n in (-oo:+oo)
3*n+5 = 29-5*n // - 29-5*n
3*n-(-5*n)-29+5 = 0
3*n+5*n-29+5 = 0
8*n-24 = 0 // + 24
8*n = 24 // : 8
n = 24/8
n = 3
n = 3
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