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n in (-oo:+oo)
7*(6*n+5) = -427 // + 427
7*(6*n+5)+427 = 0
7*(6*n+5)+427 = 0
42*n+462 = 0
42*n+462 = 0
42*n+462 = 0 // - 462
42*n = -462 // : 42
n = -462/42
n = -11
n = -11
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