Respuesta :

dpatin9372

Answer:

x = -2

Step-by-step explanation:

20(x+9)=140

divide both sides by 20

x + 9 = 7

move the 9

x = 7 - 9

x = -2

Space

Answer:

x = -2

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

Equality Properties

  • Multiplication Property of Equality
  • Division Property of Equality
  • Addition Property of Equality
  • Subtract Property of Equality

Step-by-step explanation:

Step 1: Define

20(x + 9) = 140

Step 2: Solve for x

  1. Divide 20 on both sides:                    x + 9 = 7
  2. Subtract 9 on both sides:                   x = -2

Step 3: Check

Plug in x into the original equation to verify it's a solution.

  1. Substitute in x:                    20(-2 + 9) = 140
  2. (Parenthesis) Add:              20(7) = 140
  3. Multiply:                               140 = 140

Here we see that 140 does indeed equal 140.

∴ x = -2 is the solution to the equation.

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