Bending a portion of a part

I have a mount bracket with the shape of an "L." One of the sides needs to be at a 45d angle. I have attached a picture of what the part should look like. I tried sketching the part, but because of the angle I just cant get it right. I also tried using the flex tool, but it wants to bend the whole part, I'm not very familiar with that too. I wanted to know if anyone has any suggestions on how to bend this part, thank you.

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