If a + (9 + 11) = 11 + (7 + 9), then the value of $a$ is equal to

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Solution

$a + (9 + 11)$

Using associative property of addition, we can write
11 + (7 + 9) = 7 + (9 + 11) = a + (9 + 11)
$\Rightarrow a = 7$

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