Simplify:
$31 x + 7 - 82 x + 5 + 11 x$

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Solution

$31 x + 7 - 82 x + 5 + 11 x$

$= (31 x - 82 x + 11 x) + (7 + 5)$

$= (31 + 11 - 82) x + 12$

$= - 40 x + 12$

$= 12 - 40 x$

$= 4 (3 - 10 x)$

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