Which shows how you can rewrite
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\displaystyle -{1}\cdot{1}
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using the Commutative Property of Multiplication?
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\displaystyle {\left(-{1}\cdot{1}\right)}{5}=-{1}{\left({1}\cdot{5}\right)}
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\displaystyle -{1}\cdot{0}={0}
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\displaystyle -{1}\cdot{1}={1}\cdot-{1}
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