I am strugling with some basic maths and I wonderd if someone would explain this to me, I think I am looking at it all wrong.

4-(-3)=7 correct?

Well I dont understand this.

If I had 4 marbles and used the (-3) on them I would be left with 1 marble right?

Sorry guys if this seems realy dumb but I find it realy hard to get my brain around maths

$ilver