Describe the bug
Calculator computes sums such as (4 - -4) incorrectly in scientific mode [where I expect it to understand complex sums properly]

Steps To Reproduce

1. Set scientific mode
2. Type (4 - -4) into notepad copy-paste it into calculator.

Expected behavior
Calculator shows that it parsed (4 - -4) as (4 + 4) or other equivalent e.g. (4 - (-4)), (4 - (0 - 4))` etc.

Actual behavior
Calculator shows that it parsed (4 - -4) as (4 - 4) which we all know is not mathematically the same!

Device and Application Information (please complete the following information):

• OS Build: 18342.8
• Architecture: x64
• Application Version: 10.1812.10048.0