To solve the equation
\[ \frac{7}{10} - \frac{2}{3}, \]
we need to find a common denominator. The least common multiple of 10 and 3 is 30.
Next, we convert each fraction to have this common denominator:
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For \(\frac{7}{10}\): \[ \frac{7}{10} = \frac{7 \times 3}{10 \times 3} = \frac{21}{30}. \]
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For \(\frac{2}{3}\): \[ \frac{2}{3} = \frac{2 \times 10}{3 \times 10} = \frac{20}{30}. \]
Now, we can subtract the two fractions:
\[ \frac{21}{30} - \frac{20}{30} = \frac{21 - 20}{30} = \frac{1}{30}. \]
Therefore, the answer is
\[ \frac{1}{30}. \]
This matches the first response option.