Make certain Textbox negative value based on CheckBox

Good day,
I have a part of code but would need to see if there is a simple way to combine all my textbox to become negative value If my Combobox is checked.


In my Module, This will Calculate my Textbox11 each time I call for my Sub

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This will call my Sub updateTextBoxes() I have set up from Textbox2 to textbox10

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In my Userform I have a CheckBox1. If this CheckBox1 is Selected then I need to change the entry of all Textboxes(2-10) to be negative Value.

Works well right now but I need to identify all Textbox separately how could I bundle this up... even if a module is called...

So IF checkbox1 = True then textbox2 to textbox10 will = a negative value... If user adds 2 to textbox2 when the checkbox1 is = True then 2 will turn to -2

Instead of:

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Or is this the best result?

I will going to this solution:

Module:

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UserForm:

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If there would be a shorter code then please feel free... Thank you for all that was looking