Portion of a triangle

Geometry Level 4

In triangle ABC, CD is drawn such that BD = (1/3) AB, and BE is drawn such that AE = (1/3) AC. The two lines intersect at P. If the ratio of the area of the shaded region (yellow) to the total area of the triangle can expressed as a fraction \( \frac {a}{b} \) where \( a \) and \( b \) are coprime positive integers, find \( a + b\)

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