Given some information about several unknown variables, evaluate an expression containing those variables.

Problem

If 9, a, plus, 8, b, plus, 9, c, equals, minus, 9 ,
what is 81, c, plus, 72, b, plus, 81, a?
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4
  • an exact decimal, like 0, point, 75
  • a multiple of pi, like 12, space, p, i or 2, slash, 3, space, p, i