How do you solve equations with rational coefficients?

You've been doing that all this time and didn't even realize it!

Every plain old number that you ever see is a rational number.

Every equation that has plain old numbers next to the variables

is an equation with rational coefficients.

If a variable ever has (pi) or a square root or a trig function next to it,

then that's an irrational coefficient. But I'll just bet you haven't ever

seen any of these yet.