447. Решите уравнения:
[tex]1)x + \frac{4}{21} = \frac{2}{3} \times + \frac{2}{7} [/tex]
[tex]3)( \frac{4}{5} -x) + \frac{13}{20} = \frac{7}{10} [/tex]
ПОМОГИТЕ СРОЧНО ПОЖАЛУЙСТА​
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