What does a Minus plus a plus equal?
Negative plus a negative is a negative.
Ex. -1+-1=-2
Negative times a negative is a positive.
-2*-2=4
But a negative [minus] plus a positive [plus] can be minus, zero
or plus:
For example,
-3 + 2 = -1
-3 + 3 = 0
-3 + 4 = +1