At East Zone University (EZU) there are 482 students taking College Algebra or Calculus. There are 353 students taking College Algebra, 146 students taking Calculus, and 17 students taking both College Algebra and Calculus. How many students are taking College Algebra, but not Calculus?

Question

espex · Answer

Well you know that there are $482$ students in total, which is equal to the number taking Calculus, $146$ plus the number taking Algebra $353$, but there are $17$ counted twice since they are taking both classes.
How would you ensure that your total only included one counting of the $17$ students taking both classes?