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Australian AMC 2009 - Intermediate Question 7

AMC AUSTRALIA · Australian AMC 2009 - Intermediate

Question 7

$(x-y)-2(y-z)+3(z-x)$ equals
  1. $-2x-3y+5z$
  2. $-2x-3y-z$
  3. $4x+y-z$
  4. $4x+3y-z$
  5. $2x+3y-5z$