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Variable
Initial Definition
A variable is a symbol used to represent:
a number in an
expression
an unknown value in an
equation
a number or element of a
set
in a relation connecting two or more sets
Examples
Expression: 2n + 3 [the variable is n]
Equation: x + 3 = 5 [the variable is x]
Relation: y = x + 3 [the variables are x and y]
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