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The core of all algebra concepts is solving basic algebraic equations and expressions, which are defined by the inclusion of variables (e.g. x and y) and numbers.

A single-step equation may look like: 2+b=c

To solve for b, you must subtract 2 from both sides. In all of algebra, what you do to one side you must do to the other.

You get: b=c-2

Multi-step equations require, as the name suggests, more than one step to solve.

Here's an example, solving for a: 2a+7=b

First you subtract 7 from both sides: 2a=b-7

Then divide both sides by 2: a=(b=7)/a