Tim's phone service charges $30 plus an additional $0.15 for each text message sent per month. If Tim's phone bill was $45, which equation could be used to find how many text messages, x, Tim sent last month? A. $30x - $0.15 = $45
B. $30x + $0.15 = $45
C. $30 + $0.15x = $45
D. $0.15x + $45 = $30

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