Question 381468
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Hi
Let x and (90°-x) represent the angle and its complement respectively
Write as we Read***
(90°-x) = 2x + 12°
solving for x
78 = 3x
 26° = x, the angle.  Its complement is 64°     (90° -26°)

CHECKING our Answer***
  64° = 52° + 12°