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To reproduce an old photograph, a photographer charges x dollars to make a negative, $$\frac{(3x)}{5}$$ dollars for each of the first 10 prints, and $$\frac {(x)}{5}$$ dollars for each print in excess of 10 prints. If $45 is the total charge to make a negative and 20 prints from an old photograph, what is the value of x?
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以上解析由 考满分老师提供。
