Math help for school

Question

The sum of 15 and 4 times a number is the same as the difference of 3 times the number and seven

Answer 1

fifteen and 4 times a number is difference of 3 times the number and 7

 

15       +       4n                 =                            3n                  -         7

15 + 4n = 3n - 7

-15               -15

 

        4n = 3n -22

       -3n   -3n

 

         n = -22