a)\(\left|3-x\right|-2=x+2\)
\(TH1:3-x-2=x+2\)
\(\Leftrightarrow1-x=x+2\)
\(\Leftrightarrow1-x-x-2=0\)
\(\Leftrightarrow-1-2x=0\)
\(\Leftrightarrow x=-\frac{1}{2}\)
\(TH2:-\left(3-x\right)-2=x+2\)
\(\Leftrightarrow x-3-2=x+2\)
\(\Leftrightarrow x-5=x+2\)
\(\Leftrightarrow xkoTM\)
b)\(\left|2x+1\right|+x=2x-5\)
\(TH1:2x+1+x=2x-5\)
\(\Leftrightarrow3x+1-2x+5=0\)
\(\Leftrightarrow x+6=0\)
\(\Leftrightarrow x=-6\)
\(TH2:-2x-1+x=2x-5\)
\(\Leftrightarrow-x-1-2x+5=0\)
\(\Leftrightarrow4-3x=0\)
\(\Leftrightarrow x=\frac{4}{3}\)