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An equation is an equality of two expressions which has one or more unknowns. The unknowns (I think that must to be the word "these") are generally represents by letters of the alphabet. Each expression of an equation is called member, that is, an equation has two members. In the members, we can find knowns and unknowns. Both data can be added, subtracted, multiplied and (I think that must to be the word "or") divided. If we want to find the value of the unknowns, we must perform the mathematical operations necessary (I think that must to be "necessary mathematical operations).
 * Equation **

The value of unknowns can be one, more (I think that must to be the word " some") or none. This depends of the type of equation.

**Nice Job... But give it a second look before uploading it to the definition and description draft 2 **