Simplify means use Bodmass rule and solve the problem.
First you need to solve the brackets.
The first bracket is (6+3) which will be solved as (9).
The second bracket is (10-7) which will be solved as (3)
Now 9 and 3 will be multiplied to get 9x3=27.
Hence the answer is 27.
Mathematically it is written as follows:
[tex](6+3)\text{.}(10-7)=9.3=27[/tex]