Решите уравнение (х - \(\frac{13}{21})+\frac{10}{21}=\frac{17}{21}\) . а) \(\frac{40}{21}\) ; б) \(\frac{14}{21}\) ; в) \(\frac{20}{21}\)
\(\frac{20}{21}\)
\(\frac{40}{21}\)
\(\frac{14}{21}\)