# Two math problems

1) The sum of twice a number and -6 is nine more than the opposite of that number. Find the number.

2) A collection of 27 coins, all nickels, and dimes, is worth $2.10. How many of each coin are there? The dime, in United States usage, is a ten-cent coin. A nickel, in American usage, is a five-cent coin composed of 75% copper and 25% nickel.

2) A collection of 27 coins, all nickels, and dimes, is worth $2.10. How many of each coin are there? The dime, in United States usage, is a ten-cent coin. A nickel, in American usage, is a five-cent coin composed of 75% copper and 25% nickel.

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