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n in (-oo:+oo)
6*(7*n+1) = -498 // + 498
6*(7*n+1)+498 = 0
6*(7*n+1)+498 = 0
42*n+504 = 0
42*n+504 = 0
42*n+504 = 0 // - 504
42*n = -504 // : 42
n = -504/42
n = -12
n = -12
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