इन ब्रैकेट बी - 4 ब्रैकेट क्लोज
![( \: b - 7 \: ) {}^{2} ( \: b - 7 \: ) {}^{2}](https://tex.z-dn.net/?f=%28+%5C%3A+b+-+7+%5C%3A+%29+%7B%7D%5E%7B2%7D+)
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