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n in (-oo:+oo)
7*n+3 = 3*n+47 // - 3*n+47
7*n-(3*n)-47+3 = 0
7*n-3*n-47+3 = 0
4*n-44 = 0 // + 44
4*n = 44 // : 4
n = 44/4
n = 11
n = 11
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