Examlex
An efficient barter system relies on a double coincidence of wants.
Variable Substitution
The process of replacing a variable in an equation or expression with a specific value.
Exponentiation
A mathematical operation involving two numbers, the base and the exponent, where the base is multiplied by itself as many times as indicated by the exponent.
System of Equations
A set of two or more equations with the same set of unknowns, which are solved simultaneously.
Variable Substitution
Replacing a variable in an equation or expression with its corresponding value.
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