[44- (56-x) ] . 12 = 384
<=> (44-56+x) . 12 = 384
<=> (-12 + x) . 12 = 384
<=> 12x - 144 = 384
<=> 12x = 384 + 144
<=> 12x = 528
<=> x = 528 : 12
<=> x = 44
Vậy x = 44
[44-(56-x)]=384:12=32
56-x =44-32=12
x =56-12=44
\(\left[44-\left(56-x\right)\right].12=384\)
\(\Leftrightarrow44-\left(56-x\right)=32\)
\(\Leftrightarrow56-x=12\)
\(\Leftrightarrow x=44\)