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n in (-oo:+oo)
2*n+3 = 7*n-47 // - 7*n-47
2*n-(7*n)+3+47 = 0
2*n-7*n+3+47 = 0
50-5*n = 0 // - 50
-5*n = -50 // : -5
n = -50/(-5)
n = 10
n = 10
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