how do you do _+-5=-13
First make the dash an x. Then move over to the other side of the = so it looks like this:-5=-13-xYou take -13 to the other side of the equal sign so it looks like this:-5+13=-xThen:8=-x or x=-8Hopefully that makes sense.
x + -5 = -13x - 5 = -13 +5 +5x = -8Answer: The blank is -8