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subtracting: -1 - (-1) = 0 because the negative sign in "- (-1)" would be distributed to the constant/number. If you are dealing with positive integers, proceed to simple subraction. 7 - 5 = 2.

multiplication: 1 x (-2) = -2 since you multiplied a positive integer to a negative integer. 1 x 1 = 1 since you multiplied two positive integers you would get a positive answer. -3 x -3 = 9 because you multiplied two negative integers and negative multiplied to another negative integer would always be positive.