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From module Coordinate Geometry Basics
The coordinates of △ABC\triangle ABC△ABC are A(5,7)A(5,7)A(5,7), B(11,7)B(11,7)B(11,7), C(3,y)C(3,y)C(3,y), with y>7y > 7y>7. The area of △ABC\triangle ABC△ABC is 121212. What is the value of yyy?
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