Replace the variables with the correct values and calculate using the order of operations
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Algebraic expressions can be simplified by combining together like terms but there are no solution because they don't contain equality signs
Algebraic expressions are the written relations of or between variables. For example, x2, 1/x, and x + y + z are all algebraic expressions. Algebraic equations are simply algebraic expressions that equate to something. For example, x2 = 4, 1/x = y, and x + y + z = 42 are all algebraic equations. In general, one differentiates algebraic expressions from exponential, trigonometric, hyperbolic, and logarithmic expressions by requiring algebraic expressions to be confined to polynomial expressions. I've added a link regarding polynomials below.
An expression consists of algebraic terms and has no equality sign
They both use PEMDAS or Order of Operation