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