How do i fix this wall?

I need help to fix this “bug” (i’m not to sure if it is)
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This is the problem no matter what i do these two pieces never line up
If i move the bottom piece the top one overhangs
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Top overhanging
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What i am trying to achieve
How do i fix this???
Thanks in advance for any replies

Use the resizeallign plugin. If they’re the same angle then the parts should line up. First click the face you want to line up, then click the face you want to line up to.

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Thank you
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