If 7 times a certain number is added to 12, the result is 47

So first we want to assign the certain number a variable, let's say x.

So we can write this out as an equation, or:

7x + 12 = 47

Now we can just solve this.

7x + 12 - 12 = 47 - 12

7x = 35

/7 / 7

x = 5

So the certain number is 5.

5 beacause 5 times 7 is 35 and 35 plus 12 is 47.