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n in (-oo:+oo)
-7*n-1 = 11/3 // - 11/3
-7*n-(11/3)-1 = 0
-7*n-11/3-1 = 0
-7*n-14/3 = 0 // + 14/3
-7*n = 14/3 // : -7
n = 14/3/(-7)
n = -2/3
n = -2/3
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