How can I calculate two values ​​in different lines? (DAX)

[Reporting]

How can I subtract two values ​​(high value minus low value) if they are in different lines? In the respective line are different texts that could be used as a condition. 

Here he should count 70-65 and give out 5 as result.

I hope you can help me.

[Anonymous]

https://community.powerbi.com/t5/Community-Blog/How-to-Get-Your-Question-Answered-Quickly/ba-p/38490

Best

Darek