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n in (-oo:+oo)
3*n-(2*n)-6/7 = 1/56 // - 1/56
3*n-(2*n)-6/7-(1/56) = 0
3*n-2*n-6/7-1/56 = 0
n-7/8 = 0 // + 7/8
n = 7/8
n = 7/8
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