[{6x-72}:2 -84].28=5628
\(\Rightarrow\)(6x-72):2 -84=5628:28
\(\Rightarrow\)(6x-72):2 -84=201
\(\Rightarrow\)(6x-72):2 =201+84
...
\(\left[\left(6x-72\right):2-84\right]\cdot28=5628\)
\(\left(6x-72\right):2-84=5628:28\)
\(\left(6x-72\right):2-84=201\)
\(\left(6x-72\right):2=201+84\)
\(\left(6x-72\right):2=285\)
\(6x-72=285\cdot2\)
\(6x-72=570\)
\(6x=570+72\)
\(6x=642\)
\(x=642:6\)
\(x=107\)
Vậy \(x=107\)
[{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=285.2
6x-72=570
6x=570+72
6x=642
x=642:6
x=107
VẬY x=107
