Ta có :
\(x-3=2\left(x-3\right)-\left(-14+50\right)\)
\(\Leftrightarrow x-3=2x-6+14-50\)
\(\Leftrightarrow x-2x=-6+14-50+3\)
\(\Leftrightarrow-x=-39\)
\(\Leftrightarrow x=39\)
Bài giải
\(\left(x-3\right)=2\left(x-3\right)-\left(-14+50\right)\)
\(\left(x-3\right)=2x-6+14-50\)
\(\left(x-3\right)=2x-42\)
\(2x-x=42-3\)
\(x=39\)
\(\left(x-3\right)=2\left(x-3\right)-\left(-14+50\right)\)
\(\left(x-3\right)=2x-6+14-50\)
\(\left(x-3\right)=2x-42\)
\(2x-x=42-3\)
\(x=39\)
\(x-3=2\left(x-3\right)-\left(-14+50\right)\)
\(\Leftrightarrow2\left(x-3\right)-\left(x-3\right)=-14+50\)
\(\Leftrightarrow x-3=36\)\(\Leftrightarrow x=39\)
Vậy \(x=39\)