SOLUTION:
Step 1:
In this question, we are given the following:
[tex]7\text{ + 8 + 12 = }\ldots\ldots..\text{ + 12}[/tex]Step 2:
From the question, we can see that:
[tex]7\text{ + 8 + 12 = 15 + 12 }[/tex]CONCLUSION:
We can see clearly that the missing number is 15
