>This could be simplified considerably: "Fill in Z. If you are X or Z=1, fill in Y.".
If I have to solve an equation to user your app, a) I won't, b) It's badly designed.
If I have to solve an equation to user your app, a) I won't, b) It's badly designed.
Hardly equation solving.
Checking the box disables the job title field.
You don't need to make user interfaces that behave like paper forms.