\(\frac{120}{1,2x}+\frac{2}{3}=\frac{120}{x}\Rightarrow\frac{100}{x}+\frac{2}{3}=\frac{120}{x}\)
\(\Rightarrow\frac{20}{x}=\frac{2}{3}\Rightarrow x=\frac{20.3}{2}=30\)
120/1.2x+2/3=120/x
100/x-120/x=-2/3
-20/x=-2/3
x=30
\(\frac{120}{1.2x}\)\(+\frac{2}{3}\)\(=\frac{120}{x}\)\(\Rightarrow\frac{100}{x}\)\(+\frac{2}{3}\)\(=\frac{120}{x}\)
\(\Rightarrow\frac{20}{x}\)\(=\frac{2}{3}\)\(\Rightarrow x=\frac{20.3}{2}\)\(=30\)
@Trungmh