Answer:8 + ( 5 +3)= ( 10 +4)+3=Step-by-step explanation:1. Focus on the left side: We need to find a number that, when added to 3, makes the left side of the equation equal to the right side.2. Simplify the right side: The right side simplifies to (___ + 4) + 3 = ___ + 7.3. Find the missing number on the left: To make the left side equal to ___ + 7, the missing number must be 5. This is because 8 + (5 + 3) = 8 + 8 = 16.4. Complete the equation: The completed equation is: 8 + (5 + 3) = (10 + 4) + 3 = 16. Therefore, the missing numbers are 5 and 10.