x - ( 30 + 4 ) x 3 = 47
x - ( 34 x 3 ) = 47
x - 102 = 47
x = 102 + 47
x = 149
x-(30+4)x3=47
x-34x3=47
x-102=47
x=47+102
x=149
x-( 30+4)x3=47
x- 102 = 47
x = 102+47
x = 149
k minh nha
x - ( 30 + 4 ) x 3 = 47
x - ( 30 + 4 ) = 47
x - ( 34 x 3 ) = 47
x - 102 = 47
x = 47 + 102
x = 149
x - 34 x 3 =47
x - 102 = 47
x = 47 + 102
x =149
x - ( 30 + 4 ) x 3 = 47
x - ( 34 x 3 ) = 47
x -102 = 47
x = 102 + 47
x = 149