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Factorise (5a+2/3)^2-(2a-1/3)^2

$Given {(5 a + \frac{2}{3})^{2} - (2 a - \frac{1}{3})}^{2} = 0 \Rightarrow (5 a + \frac{2}{3} + 2 a - \frac{1}{3}) (5 a + \frac{2}{3} - 2 a + \frac{1}{3}) = 0 \Rightarrow (7 a + \frac{1}{3}) (3 a + 1) = 0 \Rightarrow a = \frac{- 1}{21}, \frac{- 1}{3}$

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