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Creating a System of Infinite Solutions

ACTMAT-1EOYKU

What should be the value of $x$ so that the given system of equations would have an infinite number of solutions?

$ 4a+12b\sqrt { 3 } =8$
$6a+3bx=12 $

A

$0$

B

$18$

C

$ 6\sqrt { 3 } $

D

3

E

The given information is insufficient.