Add r to the difference of s and t, then add q to the result
the difference of s and t
s - t
Add r to the difference of s and t
s - t + r
Add r to the difference of s and t, then add q to the result
s - t + r + q
the difference of s and t
s - t
Add r to the difference of s and t
s - t + r
Add r to the difference of s and t, then add q to the result
s - t + r + q