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replace the variables with the given values and simplify using the order of operations.
You cannot usually simplify numbers. What you can simplify is numeric or algebraic expressions. You carry out the various operations but use BODMAS (I prefer BIDMAS) to determine the order. First do the Brackets. Next the Index (or power Of) Then, with equal priority, Division and Multiplication And last, again with equal priority, Addition and Subtraction.
Follow the rule about the order or operations!
Algebra vocabulary refers to the terminology and symbols used in algebraic expressions, equations, and operations. Some common algebra vocabulary includes variables, constants, coefficients, exponents, terms, equations, inequalities, functions, and graphs. Understanding and using this vocabulary is essential for solving algebraic problems and communicating mathematical ideas effectively.
If you are using the X to mean multiply, then the answer is -18. Otherwise, if this is algebra, and the X is a variable, then numbers against a variable always means to multiply, so it would simplify to -18X.