Can Mathematica help to rearrange an equation?

Question

I have an equation which I want to rearrange so one variable is on the left side by itself.

Normally, I would do this with basic algebra and identities.

However, is it possible to use Mathematica to do this for me, automatically?

Answer 1

That is an extremely general question, but usually, yes.
The commonly used functions used are Solve and Reduce:

Reduce[x^2 + a x + 1 == 0, a]

x != 0 && a == (-1 - x^2)/x

The documentation pages linked above contain many examples. Please read these, and if necessary narrow your question to a specific difficulty or problem.