Explanation:
a + b = 6
a - b = 1/3
a = 6 - b
6 - b - b = 1/3
6 - 2b = 1/3
18 - 6b = 1
6b = 17
b = 17/6
a + 17/6 = 6
a = 6 - 17/6
a = 36 - 17/6
a = 19/6
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