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 Description  
 Unknown:  A variable whose values are solutions of the equation that they are written in.
For example,

In the equation 3x + 4 = 13, "x" is the unknown. It has the value of x = 3 found by solving the equation for x.

In the system of equations
2x - y = 9
3x + y = 1
the unknowns are "x" and "y" which have the values x = 2 and y = -5 found by solving the system for x and y.