If

7 + = 13,

then

13 − 7 =

If

+ 6 = 11,

then

11 − 6 =

If

10 + = 19,

then

19 − 10 =

If

+ 8 = 15,

then

15 − 8 =

If

+ 4 = 10,

then

10 − 4 =

If

+ 4 = 14,

then

14 − 4 =

If

8 + = 12,

then

12 − 8 =

If

+ 9 = 18,

then

18 − 9 =

If

+ 3 = 7,

then

7 − 3 =

If

5 + = 8,

then

8 − 5 =

If

9 + = 14,

then

14 − 9 =

If

6 + = 9,

then

9 − 6 =

If

+ 5 = 12,

then

12 − 5 =

If

3 + = 8,

then

8 − 3 =

If

+ 2 = 9,

then

9 − 2 =