${\left(\left(2\frac{4}{7}-1\frac{2}{3}\right)+\frac{5}{21}\right)*x=8
\\\left(\left(\frac{18}{7}-\frac{5}{3}\right)+\frac{5}{21}\right)*x=8
\\\left(\left(\frac{54}{21}-\frac{35}{21}\right)+\frac{5}{21}\right)*x=8
\\\frac{14}{21}*x=8
\\\frac{2}{3}*x=8
\\2*x=24
\\x=12}$
\\\left(\left(\frac{18}{7}-\frac{5}{3}\right)+\frac{5}{21}\right)*x=8
\\\left(\left(\frac{54}{21}-\frac{35}{21}\right)+\frac{5}{21}\right)*x=8
\\\frac{14}{21}*x=8
\\\frac{2}{3}*x=8
\\2*x=24
\\x=12}$
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