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to find the cost of one cell phone, all you have to do is divide the total cost by the number of units.

you'll have:

 \frac{6a^2 + 5ab - 6b^2}{3a-2b} \\ factor~the~numerator \\   \frac{6a^2+5ab-6b^2}{3a-2b} = \frac{(3a-2b)(2a+3b)}{3a-2b} \\ cancel~out~(3a-2b) \\ therefore~the~cost ~of~one~cell~phone~is~ (2a+3b)

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