\(268-4.\left\{156-6.\left[54-2.\left(3^2+6\right)\right]\right\}.x=172\)
\(\Leftrightarrow268-4.\left\{156-6.\left[54-2.15\right]\right\}.x=172\)
\(\Leftrightarrow268-4.\left\{156-6.24\right\}.x=172\)
\(\Leftrightarrow268-4.12.x=172\)
\(\Leftrightarrow268-48x=172\)
\(\Leftrightarrow48x=96\)
\(\Leftrightarrow x=2\)
hok tốt nha!!!!