Respuesta :

olivia1410

Answer:

x = -3

Step-by-step explanation:

seperate this equation into different sides where like terms are on each side.

12x + 20 = 5x - 10 - 3x

12x - 5x + 3x = -10 - 20

simplify

10x = - 30

[tex]x = - 3[/tex]

Space

Answer:

x = -3

General Formulas and Concepts:

Pre-Algebra

  • Order of Operations: BPEMDAS
  • Equality Properties

Step-by-step explanation:

Step 1: Define equation

12x + 20 = 5x - 10 - 3x

Step 2: Solve for x

  1. Combine like terms:                    12x + 20 = 2x - 10
  2. Subtract 2x on both sides:          10x + 20 = -10
  3. Subtract 20 on both sides:         10x = -30
  4. Divide 10 on both sides:              x = -3

Step 3: Check

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

  1. Substitute in x:                   12(-3) + 20 = 5(-3) - 10 - 3(-3)
  2. Multiply:                              -36 + 20 = -15 - 10 + 9
  3. Add:                                    -16 = -15 - 1
  4. Subtract:                             -16 = -16

Here we see that -16 does indeed equal -16.

∴ x = -3 is a solution of the equation.

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