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2 answers:
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In the question, the angles proves that this triangle is an isoceles triangle.
So we can set the two sides equal:
Add
to both sides of the equation: 
Divide both sides by 2:
We find that
. AC is also x, so, it is 6 too.
So we can set the two sides equal:
Add
Divide both sides by 2:
We find that