42 - ( 2 . x + 32 ) + 12 : 2 = 6
42 - ( 2 . x + 32 ) + 12 = 6 . 2
42 - ( 2 . x + 32 ) + 12 = 12
42 - ( 2 . x + 32 ) = 12 - 12
42 - ( 2 . x + 32 ) = 0
2 . x + 32 = 0 + 42
2 . x + 32 = 42
2 . x = 42 - 32
2 . x = 10
x = 10 : 2
x = 5
chúc bn hok tốt ~
42- ( 2 x X +32 ) +12 : 2 = 6
42 - ( 2 x X +32 ) +12 = 2 x 6
42-( 2 x X + 32 ) +12= 12
42- ( 2 x X +32 ) = 0
X= 0