Question

Simplity 9 - [x - (7+ x)]

Answer 1

`9-\lbrack x-(7+x)\rbrack`

First we resolve the part between the square brackets:

`\lbrack x-(7+x)\rbrack=(x-7-x)=0x-7=-7`

Then:

`9-\lbrack x-(7+x)\rbrack=9-(-7)`

Then you apply the opperation with the symbols knowin that:

`(+)(+)=+`
`(+)(-)=-`
`(-)(-)=+`

And the final answer is:

`9+7=16`