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n in (-oo:+oo)
(-1/7)*n = 1/14 // - 1/14
(-1/7)*n-(1/14) = 0
(-1/7)*n-1/14 = 0
-1/7*n-1/14 = 0 // + 1/14
-1/7*n = 1/14 // : -1/7
n = 1/14/(-1/7)
n = -1/2
n = -1/2
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