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n in (-oo:+oo)
2*n-5 = 7*n-60 // - 7*n-60
2*n-(7*n)-5+60 = 0
2*n-7*n-5+60 = 0
55-5*n = 0 // - 55
-5*n = -55 // : -5
n = -55/(-5)
n = 11
n = 11
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