It's D.
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Why?
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Ok, your variable is x.
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x stands for WHAT( the VALUE ) that you want to find.
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So, assume you know what x is.
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Pretend it's 10 or like infinity or what-not.
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So, x + $32.25 = $45.32.
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But you don't know x.
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But it's easy to find it.
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Subtract $32.25 on both sides, and BOOM!!
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Hope this helped!.
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Any question, ASK AWAY!!