Diophantine equation problem

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We sold respectively $m$ and $n$ units of items A and B. Assume $m ≥ 1$, and the price of each unit of A is $\$3$ more than the price of each unit of B. Assume a total of $12$ units of both items was sold, and the price of the total was $1320$. Use a Diophantine equation to determine the price and the number of each the items A and B sold.