Simplify:
$8 (5 x + 9 y) + 12 (5 x + 9 y)$

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Solution

$8 (5 x + 9 y) + 12 [5 x + 9 y]$

$\Rightarrow 40 x + 72 y + 60 x + 108 y$

$\Rightarrow 40 x + 60 x + 72 y + 108 y$

$\Rightarrow 100 x + 180 y$ .

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