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