Answer:
6 -

3² -

7 -
=

Explanation:
1. 6 -

First, apply the exponent to 2/3. Because it's to the second power, multiply 2/3 by itself.

6 -

Now, subtract.
6 -
=

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2. 3² -

First, apply the exponent.
3² = 9
9 -

Now, subtract.
9 -


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3. 7 -

First, apply the exponent.
=

7 -

Now, subtract.
7 -

hope this helps!