2x−92402x−9240=39803980⇒⇒2x−92x−9=240.3980240.3980=117117
2x−9=1172x−9=117⇒⇒2x=117+9=1262x=117+9=126⇒⇒x=126:2=63
Ta có 2x–9/240=39/80=117/240. suy ra 2x – 9 = 117
Từ đó tìm được x = 63
\(2.x-\frac{9}{240}=\frac{39}{80}\)
\(\frac{39}{80}=\frac{117}{240}\)
\(\Rightarrow2.x-\frac{9}{240}=\frac{117}{240}\)
\(\Rightarrow2.x-9=117\)
\(\Rightarrow2x=126\)
\(\Rightarrow126:2=63\)
Vậy: x = 63