A cellbphone company charges $10 per month for up to 500 text messages and $0.15 for each additional text message. Stanley was charged $14.50 last month for text messages.

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  1. 10 + .15(n-500) = 14.50

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  2. X text messages.
    10 + 0.15x = 14.50.
    X = 30.

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