divide the sum of 13/5 and -12/7 by the product of -31/7 and 1/-2 and add the result to (-2/3-1/3)

Answer 1

(13/5-12/7)/(-31/7*-1/2) + (-2/3-1/3) =

(91/35-60/35)/(31/14) + (-1) =

(31/35)/(31/14) - 1 = ?