Perform the indicated operation(s) and simplify.
3
3
(
7
21
−
15
)
=
\displaystyle {3}\sqrt{{{3}}}{\left({7}\sqrt{{{21}}}-\sqrt{{{15}}}\right)}=
3
3
(
7
21
−
15
)
=
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\displaystyle
Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity