To find the sum of two fractions with different denominators, a common denominator must be found.
In this case, the two in the denominator must be multiplied to make it 14.
14/2 = 7, so multiply 2 by 7 to get 14, and what you do to the bottom you must do to the top, so 1 * 7 = 7.
Now, your two fractions are 7/14 and 1/14. Add the numerators as the denominators are equal.
7+1 = 8
8/14 is the sum, which can be divided by 2 on the top and bottom to simplify.
8/2 = 4, and 14/2 = 7
4/7