\(\left[124-\left(20-4x\right)\right]:30+7=11\)
\(\left[124-\left(20-4x\right)\right]:30=11-7\)
\(\left[124-\left(20-4x\right)\right]:30=4\)
\(\left[124-\left(20-4x\right)\right]=4.30\)
\(124-\left(20-4x\right)=120\)
\(20-4x=124-120\)
\(20-4x=4\)
\(4x=20-4\)
\(4x=16\)
\(x=16:4\)
\(x=4\left(TM\right)\)
Vậy \(x=4\) là giá trị cần tìm