[ ( 4x+28 ) . 3 + 55 ] : 5 = 35 ( 4x+28 ) . 3 + 55 = 35 . 5 = 175 ( 4x+28 ) . 3 = 175 – 55 = 120 ( 4x+28 ) = 120 : 3 = 40 4x = 40 – 28 = 12 x = 12 : 4 = 3 Bình luận
[ ( 4x+28 ) . 3 + 55 ] : 5 = 35
( 4x+28 ) . 3 + 55 = 35 . 5 = 175
( 4x+28 ) . 3 = 175 – 55 = 120
( 4x+28 ) = 120 : 3 = 40
4x = 40 – 28 = 12
x = 12 : 4 = 3