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1978 AMC 12 Question 1

AMC12 · 1978 AMC 12

Question 1

If $1-\frac4x+\frac4{x^2}=0,$ then $\frac2x$ equals
  1. $-1$
  2. $1$
  3. $2$
  4. $-1$ or $2$
  5. $-1$ or $-2$