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The sum of a number and additive inverse is zero.

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$\"\"$ (Add $\"\"$ to each side)

$\"\"$ (Add: $\"\"$ )

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The product of a number and multiplicative inverse is one.

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$\"\"$ (Divide each side by $\"\"$ ) $\"\"$ (Cancel common terms)

$\"\"$ (Reciprocal of $\"\"$ )

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