"I'm thinking of a number. If you multiply it by 8 and then subtract 13, you will
get 43. What is my number?"

First, set up an equation that models this statement.

N is your variable because it’s the unknown Number.

8n-13=43

Then, add 13 on both sides so you have the variable and it’s coefficient alone.

8n-13=43
+13.+13

8n=56

Then, divide the variable and the coefficient by the coefficient.

8n=56
—. —
8. 8

Now you have your variable all by itself, and you have the persons number.

n=7

Your number is 7.