A two- digit number is formed by either subtracting 17 from nine times the sum of the digits or by adding 21 to 13 times the difference of the digits. Find the number
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let the digits be x and y
17-9(x+y)=21+13(x-y)
-22x+4y=4
or.... 11x-2y=-2
17-9(x+y)=21+13(x-y)
-22x+4y=4
or.... 11x-2y=-2
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