A student solved the following problem and made an error. In which line did the student make the first mistake. Line A, Line 2, Line 5, or Line 6

Fractions can be added and subtracted only if they're fractions. a. like b. proper c. improper d. unlike

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

(least common multiples) the answer that i had in the 1st step was lcm of airline tickets sold=72. idk if that even matters but just in case. ! three co-workers are busy selling airline tickets over the phone. in an 8-hour day, charles can sell 8 airline tickets, ann can sell 9 airline tickets, and michelle can sell 6 airline tickets. step 2 of 2: what is the smallest number of 8-hour days needed for each of them to achieve the same number of sales? it takes charles . it takes . it takes .