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\[\left( 7-√54 \right) - \left( 5+√24 \right)\]

Distribute -1 to the brackets..

\[-1(5+2 \sqrt{6}) = ??\]

= -5-2√6

Yep..

Now:
\[7- 3\sqrt{6} - 5 - 2\sqrt{6} = ??\]

2-5√6? D:

Then where is the problem??
Yes, well done...

I guess I just needed a walkthrough. Hah thanks!