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n in (-oo:+oo)
(-1/8)*n = 2/7 // - 2/7
(-1/8)*n-(2/7) = 0
(-1/8)*n-2/7 = 0
-1/8*n-2/7 = 0 // + 2/7
-1/8*n = 2/7 // : -1/8
n = 2/7/(-1/8)
n = -16/7
n = -16/7
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