Task: Question Answering
Input (English): Problem: find the value of x ? ( 2 / 7 ) ^ - 8 * ( 7 / 2 ) ^ - 2 = ( 2 / 7 ) ^ x 
Options: a ) - 5 , b ) - 6 , c ) 4 , d ) 0 , e ) - 4
Output (English): b