Task: Question Answering
Input (English): Problem: if - 2 / ( a - 6 ) = 4 / ( a + 4 ) , then a = ? 
Options: a ) 2 / 3 , b ) 1 / 2 , c ) 5 / 3 , d ) 8 / 3 , e ) 7 / 3
Output (English): d