Respuesta :

Space

Answer:

21x - 9

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

Distributive Property

Algebra I

  • Terms/Coefficients

Step-by-step explanation:

Step 1: Define

18x - (-3x + 9)

Step 2: Simplify

  1. Distribute negative:                    18 + 3x - 9
  2. Combine like terms:                   21x - 9