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AMC8 2027 - Self-practice Set 5 Question 20

AMC8 · AMC8 2027 - Self-practice Set 5

Question 20

Define $a\oplus b=2a+3b$. If $(x\oplus3)\oplus4=12$, find $x$.
  1. $\frac92$
  2. $-\frac92$
  3. $-\frac{21}2$
  4. -21
  5. 21