Này là toán lớp 5 à!?
\(\Leftrightarrow1,2\times\frac{2,4x-0,28}{x}=1,44\)
\(\Leftrightarrow\frac{2,4x-0,28}{x}=1,2\)
\(\Leftrightarrow1,2x=2,4x-0,28\)
\(\Leftrightarrow1,2x-2,4x=-0,28\)
\(\Leftrightarrow-1,2x=-0,28\)
\(\Leftrightarrow x=\frac{7}{30}\)