ok firstly its algebra:

It says think of a number, then add 6, now add the number you were first thinking of, divide by 2, subtract 3

i need this all in algebra

It started off with:

think of a number = n

add 6 = n+6

but i need to know the rest, so what would the rest of it be?

add the number you were first thinking of = ?

divide by 2 =?

subtract 3 = ?

and the answer is the number we were first thinking of, so can you please help?