GAUSS8 2003 Problem 5

Past Contests GAUSS8 GAUSS (GR. 8) - 2003
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1

In the diagram, triangle ABC is isosceles, with AB=AC. If \angle{ABC}=50^\circ and \angle{DAC}=60^\circ, the value of x is

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Answer Choices
A. 70
B. 50
C. 80
D. 60
E. 30