\(\left(\frac{1}{3}x-\frac{1}{4}+\frac{1}{5}\right):\left(\frac{1}{6}+\frac{1}{7}\right)=\frac{5}{84}\)
đúng đề chưa
\(\left(\frac{1}{3}x-\frac{1}{4}+\frac{1}{5}\right):\frac{13}{42}=\frac{5}{84}.\)
\(\frac{1}{3}x-\frac{1}{4}+\frac{1}{5}=\frac{65}{3528}\)
\(\frac{1}{3}x=\frac{1207}{17640}\)
\(x=\frac{1207}{5880}\)