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3/49n + 12/49 - 6/12 + 2/3n = 1/2
3/49 n + 2/3 n = 1/2 - 12/49 + 6/12
9/147 n + 98/147 n = 1/2 -12/49 + 1/2
107/147 n = 1 - 12/49
107/ 147 n = 49/49 - 12/49
107/147 n = 37/49
n = 37/49 . 147/107
= 111/107
= 1, 037