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SMO 2019 Junior Round 1 Question 3

SMO · SMO 2019 Junior Round 1

Question 3

If $x-\frac1x=3$, what is the value of $\frac{21}{2}-\frac36x^2+\frac32x$?
  1. $6$
  2. $7$
  3. $8$
  4. $9$
  5. $10$