The TI-83 Plus had an equation solver that didn't actually do any solving, it would test lots of inputs and converge towards the correct answer. If it was a rat

The TI-83 Plus had an equation solver that didn't actually do any solving, it would test lots of inputs and converge towards the correct answer. If it was a rational number it worked, but it couldn't do fractions so anything else and you'd only get an approximation when it hit its limit.