Question

Three multiplied by the sum of 4 and a number is the same as 18 more than the number. Find the number.

If n is "the number," which equation could be used to solve for the number?

3n + 4 = n + 18
4(3 + n) = n + 18
3(4 + n) = n + 18

Answer 1

That sounds like the way to solve for n.
12 +3n = n +18
3n -n = 18-12
2n = 6
n =3 3 would be the number, but do you understand how to translate the given written form to get 3(4+n) = n + 18

Answer 2

The sum of 4 and a number is 4 + n
Three times that is 3(4 + n)
18 more than a number is n + 18

3(4 + n) = n + 18