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|An identity is an algebraic equality which is true whatever the value of letter involved is
|Is an equality in which there is at least one letter that is called the unknown
|The solution of the equation
|Is the value or values of the unknown (or of the unknowns) that make the equation equal.
|To solve an equation
|Is to work out the solution, or solutions, or to arrive at conclusion that there isn´t a solution
|Two equations are equivalent
|if they have the same solutions or neither have a solution
|First degree (linear) equations
|In there x only appears to the power of 1.
|Second degree equations
|Involve at least one variable that is squared, or raised to a power of two.
|Each side of the equal sign is called a member
|Addition, Subtraction, multiplication or division
|' = ' The equations always have equal signs
|The variables refer to the unknown, you can use any letter
|It is the number that is attached to the variable
|They are the numbers that go alone without variable