Think of it as a function. Privilege ia the y-intercept, trying hard is the multiplier, doing are all the factors with an x, and success is your desired Y.

Solve the equation and voila. Doing can be negative if your desired Y goes in that direction from your y-intercept. Remember, you can also control which way axes point.

This can be a multivariate function/equation. It can also have multiple dimensions. The important part is that all of it is definable by you.