What is 9 more then the sum of a number and three is 35 into a equation

Alright, first let's make a variable for the number.

'n'

Pretty easy right?

Now, we know that the equation contains the sum of n and 3.

n + 3

Since 35 is 9 more than the sum of n and 3:

(n + 3) + 9 = 35

Great! Now we have the equation!

We can open the parentheses and add 9 and 3

n + 12 = 35

Subtract both sides by 12:

n = 23

The unknown number is 23!