exam Maths Puzzle Numerical Ability

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concert tickets: tickets for a concert cost $5, $3, and $2. twice as many $5 tickets were sold as $2 tickets. the recipts for 750 tickets were $2625. haw many of each price ticket were sold? [i have no clue how ti set this up] what is the answer to

(3x+7)(2x-5)=0