[(6x - 72 ) : 2 - 84 ] . 28 = 5628
( 6x - 72 ) : 2 - 84 = 5628 : 28
( 6x - 72 ) : 2 - 84 = 201
( 6x - 72 ) : 2 = 201 + 84
( 6x - 72 ) : 2 = 285
6x - 72 = 285 x 2
6x - 72 = 570
6x = 570 + 72
6x = 642
x = 642 : 6
x = 107
(6x-72):2-84 = 5628 : 28
<=> (6x-72):2-84 = 201
<=> (6x-72):2 = 201+84
<=> (6x-72):2 = 285
<=> 6x-72 = 285.2
<=> 6x-72 = 570
<=> 6x = 570+72
<=> 6x =642
<=> x =642:6
<=> x =107
k cho mình nha
(6x - 72) : 2 - 84 = 5628 : 28
=201
(6x - 72) : 2 = 201 + 84 = 285
6x - 72 = 285 . 2 =570
6x = 570 + 72 = 642
x = 642 : 6 =107