www.mathplanet.com/education/algebra-1/discovering-expressions,-equations-and-functions/expressions-and-variables

An algebraic expression comprises both numbers and variables together with at
least one ... Evaluate the expression when x=5 .... How to solve linear equations.

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www.khanacademy.org/math/algebra/one-variable-linear-equations/alg1-intro-equations/v/variables-expressions-and-equations

Learn what variables, expressions, and equations are.

www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-variables-expressions

Learn how to manipulate expressions and solve equations and inequalities. ...
Learn how to combine like terms (with negative numbers and variables),
including ...

www.mathpapa.com/algebra-calculator.html

y=x^2+1 (Graph Example), 4x+2=2(x+6) (Solve Example) ... If you would like to
create your own math expressions, here are some symbols that the calculator ...

www.wikihow.com/Solve-an-Algebraic-Expression

How to Solve an Algebraic Expression. An algebraic expression is a
mathematical phrase that contains numbers and/or variables. Though it cannot
be solved ...

www.cliffsnotes.com/study-guides/basic-math/basic-math-and-pre-algebra/variables-algebraic-expressions-and-simple-equations/variables-and-algebraic-expressions

Before you start solving equations, you should have a basic understanding of
variables, as well as translating and evaluating algebraic expressions.

www.wtamu.edu/academic/anns/mps/math/mathlab/beg_algebra/beg_alg_tut4_vari.htm

Beginning Algebra Tutorial 4: Introduction to Variable Expressions and Equations
... an expression. Know when a number is solution to an equation or not.

www.sparknotes.com/math/algebra1/expressionsandequations/section6.rhtml

A summary of Solving Equations with a Variable on Both Sides in 's Expressions
and Equations. Learn exactly what happened in this chapter, scene, or section ...

www.corestandards.org/Math/Content/6/EE/

Write and evaluate numerical expressions involving whole-number exponents. ...
Use variables to represent numbers and write expressions when solving a ...