Mainly that somewhere in the equation there is an absolute value, usually of an expression that involves the variable.
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It is an equation used to anwer an absolute value inequality.
An absolute personal equation is the difference between an observed value and a standard value assumed as being true.
Absolute value means disregarding the negative sign if it exists. So 5, +5, -5 all have the absolute value of 5.
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Absolute Value means the distance from 0, and so you should solve the equation with the number inside the Absolute Value lines as a positive and then solve again as a negative.