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n in (-oo:+oo)
7*n+6 = 2*n-49 // - 2*n-49
7*n-(2*n)+6+49 = 0
7*n-2*n+6+49 = 0
5*n+55 = 0 // - 55
5*n = -55 // : 5
n = -55/5
n = -11
n = -11
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