Holding all other variables constant, and integrating their effects into the constant term, the equation for basic mail 
Using variables, constants and integration to work out an equation.
Holding one of the variables constant and integrating only its effect into the constant.
A guy is jumping in his car.
The dog is attacking his owner.
The kids are dry
a deer drinks from a river alone
A man is standing in dry leaves
The woman is shopping in a store.