conversations.from: human
conversations.value: Gnuff charges a flat rate of $20 per tutoring session plus $7 per minute. The total amount paid for Gnuff for tutoring for one session is $146. How many minutes did Gnuff tutor for?
  Give me a solution to this problem
conversations.from: assistant
conversations.value: First find the amount paid just for the per-minute fee, which is $146 - $20 = $126.
  Then divide that number by the per-minute rate to find the number of minutes: $126 / $7 per minute = 18 minutes.