А у тебя как дела перевод на английский

Возможны несколько вариантов ответов. Более формальные:

And how are you?

And how are you doing?

And how do you do?

And how are your things?

And how is it going?

And how is everything?

Более неформальные варианты:

What's up?

How's it going?

What's going on?

What's new?