Hi there!
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I believe your answer is:
$62
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Here’s why:
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[tex]\rightarrow x + 450 = 512\\\\\rightarrow x + 450 - 450 = 512 - 450\\\\\rightarrow x = 62[/tex]
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There was $62 before the $450 was deposited.
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Hope this helps you. I apologize if it’s incorrect.