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n in (-oo:+oo)
6 = (n+7)/3 // - (n+7)/3
6-((n+7)/3) = 0
(-1*(n+7))/3+6 = 0
(-1*(n+7))/3+(3*6)/3 = 0
3*6-1*(n+7) = 0
11-n = 0
(11-n)/3 = 0
(11-n)/3 = 0 // * 3
11-n = 0
11-n = 0 // - 11
-n = -11 // * -1
n = 11
n = 11
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