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Solving Inequalities
with Variables
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Solving Inequalities
with Variables
Solving Fractions
with Variables
Solving Proportions
with Variables
Solving Equations
with Variables
Simplifying
Expressions with Variables
6:55
Khan Academy
Sal Khan
Variables, expressions, & equations
In algebra, we use variables like x, y, and z to represent unknown values. Expressions are combinations of variables and numbers, while equations equate two expressions. Variables can take on different values depending on the context, and we can evaluate expressions by substituting values for the variables.
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