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Which one of the following choices correctly represents and solves the equation?

Two times a number plus four is twelve.

A

$2(4) + x = 12$
$x = 4$

B

$2x + 12 = 4$
$x = -4$

C

$2(x + 4) = 12$
$x = 2$

D

$2x + 4 = 12$
$x = 4$