Nicole C. answered 09/19/12
Increase confidence in math and science, chemistry, algebra II
Did you mean to finish the question as "what is the number" instead of "what is the difference"?
You need to think about how the words translate into symbols
difference means (-) subtraction
four times means (4x) multiplying something by 4
a number (n) n can represent anything for the time being
the same means (=) equals
two times means (2x) multiplying something by 2
Then you put the sentence into symbols and numbers
4 x n - 3 = 2 x 7
4n - 3 = 14
4n = 17
n = 17/4 = 4.25