Twice a number plus $7$ equals thrice the number minus $5$. The number is

Twice a number plus $7$ equals thrice the number minus $5$. The number is
  1. $12$
  2. $2$
  3. $6$
  4. $1$

Solution

$2x + 7 = 3x - 5 \Rightarrow x = 12$.

Asked in: IMO

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