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formulas for subtracting integers

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Mathgeekviz
(+a) - (+b) = (+a) + (-b) : then apply the rule of addition.
(+a) - (-b) = (+a) + (+b) ; then apply the rule of addition.
(-a) - (+b) = (-a) + (-b) : then apply the rule of addition.
(-a) - (-b) = (-a) + (+b) ; then apply the rule of addition.