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n in (-oo:+oo)
(8-n)/3 = 4/3 // - 4/3
(8-n)/3-(4/3) = 0
(8-n)/3-4/3 = 0
8-n-4 = 0
4-n = 0
(4-n)/3 = 0
(4-n)/3 = 0 // * 3
4-n = 0
4-n = 0 // - 4
-n = -4 // * -1
n = 4
n = 4
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