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{{ printedBook.courseTrack.name }} {{ printedBook.name }} A **literal equation** is an equation that is comprised mostly or entirely of variables, usually representing known quantities.
$A=πr_{2}a_{2}+b_{2}=c_{2}E=mc_{2}$
The three literal equations above are the area of a circle, the Pythagorean Theorem and Einstein's mass-energy equivalence. Literal equations can be solved, using the Properties of Equality to isolate a variable.