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n in (-oo:+oo)
7*n+6 = 34-7*n // - 34-7*n
7*n-(-7*n)-34+6 = 0
7*n+7*n-34+6 = 0
14*n-28 = 0 // + 28
14*n = 28 // : 14
n = 28/14
n = 2
n = 2
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