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n in (-oo:+oo)
7*n+4 = 3*n+24 // - 3*n+24
7*n-(3*n)-24+4 = 0
7*n-3*n-24+4 = 0
4*n-20 = 0 // + 20
4*n = 20 // : 4
n = 20/4
n = 5
n = 5
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