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Evaluate expressions using structure

If a+b=−1a + b = -1 and x+y+z=2x + y + z = 2,
what is 7a+7b+6z+6x+6y7a + 7b + 6z + 6x + 6y?
  • 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}