Mathematics · Geometry

In a geometric figure, AB is parallel to HG. If the alternate interior angle &ang;HDC is represented as (10a + 5)° and the exterior angle of ΔECF is represented as (40 + 6a − 5)°, what is the value of a?

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In a geometric figure, AB is parallel to HG. If the alternate interior angle &ang;HDC is represented as (10a + 5)&deg; and the exterior angle of &Delta;ECF is represented as (40 + 6a &minus; 5)&deg;, what is the value of a?