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In the set of equations below, how many $\bigtriangleup$s are equal to $\Diamond$?

$\bigtriangleup + \bigtriangleup = \Box$
$\Box + \bigtriangleup = \bigcirc$
$\Diamond = \bigcirc + \Box + \bigtriangleup$




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This problem is taken from the UKMT Mathematical Challenges.
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