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Equation practice with midpoints

BB is the midpoint of AC‾\overline{AC}
If:
AB=2x+1\qquad AB = 2x + 1 and
BC=5x−14\qquad BC = 5x - 14
Find ACAC.
  • 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}