Question

[Nguyễn Bảo Kiều Vy]

2) [ ( 6x - 39) : 3 ] . 28 = 84

3) 20 - [ 7 . (x - 3) + 4 ] = 2

Answer 1

[❖︵Ňɠυүễη Çɦâυ Ƭυấη Ƙїệт♔]

2) [ ( 6x - 39) : 3 ] . 28 = 84

( 6x - 39 ) : 3 = 84 : 28

( 6x - 39 ) : 3 = 3

 6x - 39  = 3 . 3 

 6x - 39 = 9

 6x = 9 + 39

 6x = 48

x = 48 : 6

x = 8

3) 20 - [ 7 . (x - 3) + 4 ] = 2

7 . (x - 3) + 4 = 20 - 2

7 . (x - 3) + 4 = 18

7 . (x - 3) = 18 - 4

7 . (x - 3) = 14

x - 3 = 14 : 7

x - 3 = 2

x = 2 + 3

x = 5