Mashaal Masha
The triangle inequality theorem states that the sum of any two sides of a triangle must be greater than the length of the third side. If a triangle has side lengths of $\mathbf{6}$ and $12$, which inequality represents the possible lengths, $x$, of the third side of the triangle?
Difficulty: Hard
A: 

$x<18$

B: 

$x>18$

C: 

$6<x<18$

D: 

$x<6$ or $x>18$

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