Please Solve for a.
(1/3) [ 3 a 3 2 ]
1 (1/3)(a + 1) (10 + a) / 9
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3 a + 1 (10 + a) / 3 2 + (10 + a) / 9
So
2 + (10 + a) / 9 = 4
(10 + a) / 9 = 2
(10 + a) = 18
a = 8