Well let’s break it down:

• 🍔 + 🍔 + 🍔 = 18
  • 3🍔 = 18
  • 🍔 = 6
• 🍔 + (🍟 • 🍟) = 5
  • 6 + 🍟^2 = 5
  • 🍟^2 = -1
  • 🍟 = I
• 🥤^🍟 - 🥤 = 3
  • 🥤^i-1 = 3
  • 🥤 = 3^1/(i-1)

Simple!