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To solve for a, you can multiply both sides of the equation by 5 to isolate a:
2/5a = 4/15
(5)(2/5a) = (5)(4/15)
2a = 20/15
2a = 4/3
Now, divide both sides by 2 to solve for a:
a = (4/3) / 2
a = 4/6
a = 2/3
Therefore, a = 2/3.