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The sum of both digits, of either of two two-digit numbers, in whatever order the digits are written, is 9. The square of either of the digits of either number, minus the product of both digits, plus the square of the other digit is the number 21. The numbers are...

Twelve less than half of a number is 7. Find the number.

Increasing a number by ten gives the same result as decreasing double the number by eight. Find the original number.