Sophia buys a mixed bunch of flowers for $15. Then she buys roses for $3 each and tulips for $2 each. Write an algebraic expression that can be used to find the total amount of money Sophia will spend on flowers if she buys any number of roses, r, and any number of tulips, p. Then find the total amount of money Sophia will spend on flowers if she buys 7 roses and 4 tulips.

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