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Answer:
Number One: 20s^2 - 13st
Number Two: 11st -t ^ 2
Number Three: 2x^2 + x^3
Number Four: 2
Number Five: -3s - 4t + 24x
Number Six: 86x + 85
Number Seven: 7x - 2
Number Eight: 6s
Number Nine: 12 + x
Number Ten: 33x + 4
Number Eleven: 12t
Number Twelfth: 35g
Number Thirteen: 16 + 16x
Number Fourteen: 4s
Number Fifteen: 2t
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