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Evaluate expressions using structure

If a+b+c=−6a + b + c = -6 and x+y=5x + y = 5,
what is 9y+9x−10a−10c−10b9y + 9x - 10a - 10c - 10b?
  • Your answer should be
  • an integer, like 66
  • a simplified proper fraction, like 3/53/5
  • a simplified improper fraction, like 7/47/4
  • a mixed number, like 1 3/41\ 3/4
  • an exact decimal, like 0.750.75
  • a multiple of pi, like 12 pi12\ \text{pi} or 2/3 pi2/3\ \text{pi}