Answer
$( -2a+6, 0)$
Work Step by Step
We use trigonometry to find that $TR = 3VR$. Thus, we find:
$(a-x) = 3 (a-2) \\ a-x = 3a -6 \\ x = -2a+6$
The y coordinate is 0, so we find that the point is:
$( -2a+6, 0)$
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