conversations.from: human
conversations.value: Ryanne is 7 years older than Hezekiah. Together Ryanne's and Hezekiah's ages equal 15 years. How many years old is Hezekiah?
  Give me a clear explanation.
conversations.from: assistant
conversations.value: Let H = Hezekiah's age
  Ryanne = H + 7
  2H + 7 = 15
  2H = 8
  H = 4
  Hezekiah is 4 years old.