Simplify the expression

Question

Find the sum of 7, 3 times a number, and 7 times the same number.  Simplify tge expression

Answer 1

the sum means that you are going to add them all up

7 is just 7

3 times a number gives you 3x

and 7 times the same number gives you 7x

so it becomes 7+3x+7x

and then you can simplify that to 7+10x