To multiply integers, you have to use four rules.
1. positive + positive = positive
eg) (+2) x (+3) = (+6)
2. negative + negative = positive
eg) (-4) x (-3) = (+12)
3. positive + negative = negative
eg) (+5) x (-3) = (-15)
4. negative + positive = negative
eg) (-6) x (+4) = (-24)
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