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Math·Algebra·Systems of two linear equations in two variables

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Which system of linear equations has infinitely many solutions?

A

$6x+2y=12$
$x+12y=72$

B

$x+2y=12$
$x+12y=72$

C

$x+2y=12$
$6x+12y=72$

D

$6x+2y=12$
$6x+12y=72$