In mathematics, an equation is a statement of an equality containing one or more variables. Solving the equation consists of determining which values of the 

variables make the equality true. Variables are also called unknowns and the values of the unknowns which satisfy the equality are called solutions of the equation.

There are two kinds of equations: identity equations and conditional equations. An identity equation is true for all values of the variable. A conditional equation is true

for only particular values of the variables kinds of equations: identity equations and conditional equations. An identity equation is true for all values of the variable. A

conditional equation is true for only particular values of the variables.