Question

( 7x - 15 ) : 3 = 2

Answer 1

(7x - 15) :3 = 2

7x - 15 = 2 x 3

7x - 15 = 6

7x = 6 + 15

7x = 21

x = 21 :7

x = 3

Answer 2

( 7x - 15 ) : 3 = 2

  7x - 15        =  2 . 3

  7x -15         =   6

          7x       =  6 + 15

            7x     =  21

              x     = 3

  vậy x = 3