Each letter represents a different digit from 1 to 9. if r=4, what number does four stand for

.

If .
But none two three-digit numbers starting with 2 give a four digit number as a result when added up, therefore

There's and left.
can't be equal to 0, because this would mean also and each letter is supposed to represent a different digit.
can't be equal 1, because .
can't be equal 2, because would be equal 4, and already
seems to be a fine digit, because then and 6 hasn't been used yet.
So .

It's possible that there are more solutions (for the rest values of and for , but I don't want to check for them :D
And sorry for my laconic explanation. I suck at this, especially in English :P

Ireally wish i can my h