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Find the values of the letters and give reasons for the steps involved. `2AB + AB1=B18`

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`2AB+AB1 = B18`
If we look at the unit digits of the given equation,
only value possible for `B` is `7` as `7`+`1` = `8`.
So,
`2A7+A71 = 718`
Now, only possible value for `A` can be `4` as `4`+`7` =`11`.
If we try `A=4` and `B=7`, then, it satisfies our addition. So, this is the correct answer.
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