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n in (-oo:+oo)
n/13 = -8/13 // + -8/13
n/13-(-8/13) = 0
n/13+8/13 = 0
1/13*n+8/13 = 0 // - 8/13
1/13*n = -8/13 // : 1/13
n = -8/13/1/13
n = -8
n = -8
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