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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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