Question

a)     (7x – 15).8 – 21 = 27

Answer 1

(7x - 15).8 - 21 = 27

(7x - 15).8 = 27 + 21

(7x - 15).8 = 48

7x - 15 = 48:8

7x - 15 = 6

7x = 6 + 15

7x = 21

x = 21 : 7

x = 3

Vậy x = 3

Answer 2

(7x - 15).8 - 21 = 27

(7x - 15).8 = 27 + 21

(7x - 15).8 = 48

7x - 15 = 48:8

7x - 15 = 6

7x = 6 + 15

7x = 21

x = 21 : 7

x = 3

Vậy x = 3