Using the given literal equation:
=-m = 5/4(n - 7)
And when =n is equal to 40, we can substitute it into the equation:
=-m = 5/4(40 - 7)
Simplifying the equation:
=-m = 5/4(33)
Now, let's solve for m:
m = -5/4(33)
Calculating this gives us:
m = -41.25