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OpenStudy (anonymous):
-(-x)=x by additive properties
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OpenStudy (skullpatrol):
$$\Huge x + (-x) = 0$$ $$\Huge (-x) + [-(-x)] = 0$$ $$\Huge (-x) + [-(-x)] = x + (-x)$$ $$\Huge [-(-x)] + (-x) = x + (-x)$$ $$\Huge -(-x) = x $$
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