\(\left(7,13+8,13\right):\left(9\frac{2}{3}-x\right)=39\)
\(15,26:\left(\frac{29}{3}-x\right)=39\)
\(\frac{29}{3}-x=15,26:39\)
\(\frac{29}{3}-x=\frac{763}{1950}\)
\(x=\frac{29}{3}-\frac{763}{1950}\)
\(x=\frac{6029}{650}\)
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