Translate this sentence into an equation. *look at picture* !

(insert any random letter)-(4x8)=9
Answer is 23 for the random number

The difference of a number times 4 and 8 is equal to 9

ok starting with number- this is the variable which we will call "n"

The difference of a "n" times 4 and 8 is equal to 9

now looking at difference- which means subtract, you need to determine which 2 numbers you need to subtract which can be determined by looking for an "and"

The difference of a "n" times 4 and 8 is equal to 9
so grouping up the relevant information
("n" times 4) - 8 is equal to 9

well "is equal to is the equivalent of an equal sign
 ("n" times 4) - 8 is equal to 9
 ("n" times 4) - 8 = 9

now, "n" times 4 is just n*4 or 4n
replacing that

4n -8 =9

tada