What is this

−40/45 ​​+1.875=-40/45+1875/1000=-40/45+15/8=71/72

Well -40/45+1.875 is something we can type into a calculator, and in doing so we get...
-40/45+1.875 = -0.8888888888888889+1.875 = 0.9861111111111111...
In fraction form, this is 71/72, which of course is much easier to write or type. 

71/72 OR 0.98611111...

I'm going to take into consideration that these are two separate terms.

-40/45 = -40/45 = -0.8888888888888889

Add that to 1.875 and you'll get:

0.9861111111111111 = 71/72