ok the problem is -1/14+(-3/7)

http://www.aaastudy.com/fra.htm

First you have to make sure they have the same number for the denominator. So make them both ??/14

-1/14
and
-6/14

http://www.mathsisfun.com/positive-negative-integers.html
Now read through this webpage, paying attention to the number line at the top and reading about subtracting negative numbers (about 1/4th of the way down).

What will you end up with?