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Fractions have a common denominator: 1

$ \frac{(15*(2-x))}{1 }+ \frac{(13*(3-x))}{1 }= \frac{(15*(2-x)+13*(3-x))}{1} $

$ \frac{(15*(2-x)+13*(3-x))}{1 }= \frac{(15*(2-x)+13*(3-x))}{1} $

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