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n in (-oo:+oo)
n/2 = 6/7 // - 6/7
n/2-(6/7) = 0
n/2-6/7 = 0
1/2*n-6/7 = 0 // + 6/7
1/2*n = 6/7 // : 1/2
n = 6/7/1/2
n = 12/7
n = 12/7
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