Hey there!
Question :-

We need to solve this arithmetic expression,as a fraction.
Solution:-

Note that (+) and (-) equals to (-).
New Arithmetic expression will be :-

Remove the parenthesis :-

Calculating the Subtraction:-

As 310 < 720, 720 contains (-) sign. Therefore, The Solution will be -410 not 410.

Converting to Fraction:-



On Simplification of this Fraction:-

On Cancelling , -410 Is the result.

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Henceforth , the answer of the arithmetic expression Will be :-(Simplified)

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I hope this helps!
Please let me know if you have any questions.
~MisterBrian