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WalterM · Answer 1 · 2018-07-08T20:19:45+0000

Let

be the first digit and

the second. Then the number is
x=10a+b

. The sum and difference of the two digits is 6, which means

$\begin{cases}a+b=6\\a-b=6\end{cases}\implies a=6,b=0$

which means the number is
x=6*10+0=60

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