It will change. It always changes.
Example 1: An addition with a negative symbol.
3 + (-4) = 3 - 4 = -1.
Example 2: A subtraction with a negative symbol.
3 - (-4) = 3 + 4 = 7
(WHY??)
Just imagine: positive sign = 'be(is, am, are)' , negative sign = 'not be(isn't, aren't, ain't)', addition = 'handsome/beautiful'
subtraction = 'ugly'.
(something)- (negative number) = (something) + (positive number)
because isn't ugly = is handsome/beautiful.
