Let be "y" the unknown number.
In order to solve this exercise you need to remember the following:
1. The word "times" indicates multiplication.
2. The Sum is defined as the result of an Addition.
3. The word "equal" indicates that you must use the following sign. This is:

Then, "the sum of a number and 5" can be expressed as following:

Therefore, you can determine that "6 times the sum of a number and 5 is equal to 3" can be represented with the expression shown below:

The answer is:
