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ArsenOO

Решение:

 frac{2}{7} x +  frac{3}{7} x = 2 frac{7}{14}

x( frac{2}{7}  +  frac{3}{7} ) = 2 frac{1}{2}

 frac{5}{7} x = 2 frac{1}{2}

x = 2 frac{1}{2}  div  frac{5}{7}

x =  frac{5}{2}  times  frac{7}{5}

x =  frac{7}{2}

x = 3 frac{1}{2}

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