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n in (-oo:+oo)
2*n+1 = 7*n-14 // - 7*n-14
2*n-(7*n)+1+14 = 0
2*n-7*n+1+14 = 0
15-5*n = 0 // - 15
-5*n = -15 // : -5
n = -15/(-5)
n = 3
n = 3
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