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n in (-oo:+oo)
(8-n)/12 = 3 // - 3
(8-n)/12-3 = 0
(8-n)/12+(-3*12)/12 = 0
8-n-3*12 = 0
-n-28 = 0
(-n-28)/12 = 0
(-n-28)/12 = 0 // * 12
-n-28 = 0
-n-28 = 0 // + 28
-n = 28 // * -1
n = -28
n = -28
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