you don't.
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if you are in math class and the teacher asks you a question about it.
Signed numbers are used for:TemperatureMoney, Accounting, or EconomyMath Problems
Many people learn algebra, and then never use it in their "real life". It's not that it COULDN'T be useful; but rather, that many people tend to forget how to use it. In some professions, you will DEFINITELY need algebra - as well as more advanced math.
There is no real answer to the equation given.
A real life example of a cliff are the white cliffs of Dover.