Fill in the blank.

4+2+_+3=15

The answer is 6

Step-by-step explanation:

If you subtract 4 from both sides you would get 2+_+3 = 11

Then if you subtract 2 from both sides you would get _+3 = 9

Finally if you subtract 3 from both sides you would get _ = 6

So the blank number is 6

6

Step-by-step explanation:

4+2+6+3=15