How would you distinguish between a Lewis acid and a Lewis base?

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• How can I complete the following equation: #CH_3CH_2NH-CH_3 + HBr ->?#
• Which definition for acids and bases is the right one: Lewis or Brønsted?
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• What definition of acids and bases emphasizes the role of protons?
• How are acids and bases defined by Brønsted theory?
• How did Lewis create his acids and bases model?
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