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** ** Equation **
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An equation is an equality of two expressions which has one or more unknowns  ** variables?? ** . These ar e generally represents  ** ED **  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 or divided. If we want to find the value of the unknowns, we must perform the necessary mathematical operations.

The value of unknowns can be one, some or none. This depends of the type of equation.