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HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 05 Question 8

HKIMO · HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 05

Question 8

Given $3x+9y=7$ and $9x-3y=-4$, find $x-y$.
  1. −3
  2. 3
  3. 1
  4. −1