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2 - 1/2n -1/3 - 1/3n = 1/4
-1/2n - 1/3n = 1/4 + 1/3 -2
-5/6n= 7/12 - 2
- 5/6n = -17/12
n = -17 /12 : -5/6
n = -17/12 x - 6/5
n = 17/10
n = 1 7/10
12/2(4 - n) - 12/3(1 + n) = 12/4
6(4 - n) - 4 (1 + n) = 3
24 - 6n - 4 - 4n = 3
-10n = 3 - 24 + 4
-10n = -17
n = 17/10 atau 1,7