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Question Number 123638 by 676597498 last updated on 26/Nov/20

$$\mathrm{show}\mathrm{that}\mathrm{if}\mathrm{x}\in \mathbb{R}\mathrm{then}\mathrm{x}\mathrm{and}-\mathrm{x}\mathrm{cannot}\mathrm{be}\mathrm{positive}$$

Commented by talminator2856791 last updated on 27/Nov/20

$$\mathrm{this}\mathrm{is}\mathrm{just}\mathrm{a}\mathrm{rule}$$

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