a minus take away a minus makes a minus
A minus plus a minus will give a sum with a minus also.
A minus by a minus by a positive gives a positive.
A minus plus a minus is not necessarily positive. A minus multiplied by a minus is. The reason being that the minus of a minus is a positive. It's a double negative.
A bigger minus.
Yes it does. A minus is the opposite of something, so the minus of a minus is a plus.