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29 January, 21:51

The sum of digits of a cetain two - digit number is 7. Reversing its digits increases the by the number nine. what is the number? you must use an algebraic expression to solve.

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  1. 30 January, 01:12
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    The number is 34.

    3 + 4 = 7

    43 - 34 = 9
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