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並前往https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:solve-equations-inequalities/x2f8bb11595b61c86:multistep-inequalities/v/multi-step-inequalities

Multi-step inequalities (video) | Khan Academy

Sal says that you swap the inequality sign when you divide by a negative number. But I'm pretty sure my ...

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