Simple integer math?

[jakie8]

x=5

x=x+2 (Which redefines x as 7)
x+=2 (shortcut)

x=x*3 (which defines x as 15)
x*=3 (shortcut)


My question is:

x=x-6

What would be the shortcut for that?

[bsxiong]

x-=6
........................

[jakie8]

Are you sure? Its not a trick question or anything?

[Clueful]

Are you sure? Its not a trick question or anything?
It would have been quicker to test it yourself.
Paste this into your address bar and press Enter:
javascript:var x=7; x-=6; alert(x);

[jakie8]

woah suhweet! Thank you friends!