Add parentheses to make this true.

4 + 8 - 2 x 3 - 7 = 15

4 + 8 - 2 x 3 - 7 = 15

Well, lets see, if we do 6 x 3 we have 18 and if we sum 4, 22 minus 7, 15

So:

4 + (8 - 2) x 3 - 7 = 15

4 + 6 x 3 - 7 = 15

4 + 18 - 7 = 15

22 - 7 = 15

15 = 15