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Trouble with equations

Hi there I need some help.
I am making a equation for a beam I am designing.

My equations work however when I modify my dimensions my sketch does not stay centered.

I have done run into this problem before and have solved it....however today I am stumped and could use a hand.
The photo should better express the issue....

I would like the center beam to stay centered....what relation am I supposed to use for this?

Thank you so much!

I'm not sure what you are trying to do. Is the vertical part you wan to keep in the center of the 10? IOW; you want it to always look like an I-beam?

If so, you need a dimension from one of the ends to center of that part of the sketch. 10/2 and the 10*.6 will take care of itself.

Not sure this helps