Ok, so 38 - 91 is like 91-38 and then just add a negative to it.
For example 1 - 2 is like 2 - 1 then add a negative so 2-1 = 1 then
add a negative so -1. So for your original equation 91-38 is 53,
and then just add a negative sign to that and it is -53. Hope this
Helps!