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Equations with parentheses: decimals & fractions

Solve for aa.
Give an exact answer.
3+0.5(4a+8)=9−2a3+0.5(4a+8)=9-2a
a=a =
  • 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}