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n in (-oo:+oo)
1/3-(8*n) = 13 // - 13
1/3-(8*n)-13 = 0
1/3-8*n-13 = 0
-8*n-38/3 = 0 // + 38/3
-8*n = 38/3 // : -8
n = 38/3/(-8)
n = -19/12
n = -19/12
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