Respuesta :

[tex]9-\lbrack x-(7+x)\rbrack[/tex]

First we resolve the part between the square brackets:

[tex]\lbrack x-(7+x)\rbrack=(x-7-x)=0x-7=-7[/tex]

Then:

[tex]9-\lbrack x-(7+x)\rbrack=9-(-7)[/tex]

Then you apply the opperation with the symbols knowin that:

[tex](+)(+)=+[/tex][tex](+)(-)=-[/tex][tex](-)(-)=+[/tex]

And the final answer is:

[tex]9+7=16[/tex]