Answer:
![-(1)/(21)](https://img.qammunity.org/2023/formulas/mathematics/high-school/cd97z62mek4qgor17rczaq3au6ynwjgg35.png)
Explanation:
The opposite of -2\3 is 2\3
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-5\7 + 2\3
Least common multiple of 7 and 3 is 21. Convert -5\7 and 2\3 to fractions with denominator 21.
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-15\21 + 14\21
Sinse -15\21 and 14\21 have the same denominator, add them by adding their numerators.
![(-15+14)/(21)](https://img.qammunity.org/2023/formulas/mathematics/high-school/h3e16dpbuooq66xqfj7hkp2k9h8u3itqz5.png)
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Add −15 and 14 to get −1.
-1\21