Gale, it's called "antidifferentiation", you don't need a . . . wait a minitue, now I'm thinking it's . . .are you joking or what? But you're right, it's not an equation. Perhaps a better phrasing would meet your requirements.
You know, antidifferentation can be done in many ways, some ways are more fun than others. The important thing is to take it slowly, taking care to do everything just right so that you arive at the right dinner . . . I mean, solution.
Also, if you're 17, then all I'll say is that truly you are a diamond in your father's eyes and I'm not the least bit interested in antidifferentiating that.