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n in (-oo:+oo)
n/7 = 6/7 // - 6/7
n/7-(6/7) = 0
n/7-6/7 = 0
1/7*n-6/7 = 0 // + 6/7
1/7*n = 6/7 // : 1/7
n = 6/7/1/7
n = 6
n = 6
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